<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Explain the problem briefly below -->
There are two packages on PYPI: [systemd (0.16.1)](https://pypi.org/project/systemd/), and [systemd-python (234)](https://pypi.org/project/systemd-python/) (which is the correct package)

If the target machine has systemd (0.16.1) installed with `pip3 install systemd` instead of `pip3 install systemd-python`, ansible fails on any module that uses `journal.sendv()` with an error saying:
```
File "systemd/_journal.pyx", line 32, in systemd._journal._send
ValueError: Key name may not begin with an underscore
```

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
`ansible/module_utils/basic.py`

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.8.2
  config file = None
  configured module search path = [u'/Users/rylanpolster/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /Library/Python/2.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 2.7.10 (default, Feb 22 2019, 21:55:15) [GCC 4.2.1 Compatible Apple LLVM 10.0.1 (clang-1001.0.37.14)]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
-
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Target: Raspbian Stretch Lite (November 2018)

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
On target: 
```
pip3 uninstall systemd-python
pip3 install systemd
```
<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: ls
  command: ls
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
`changed: [pi]`

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below
The full traceback is:
Traceback (most recent call last):
  File "<stdin>", line 114, in <module>
  File "<stdin>", line 106, in _ansiballz_main
  File "<stdin>", line 49, in invoke_module
  File "/usr/lib/python3.5/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/usr/lib/python3.5/imp.py", line 170, in load_source
    module = _exec(spec, sys.modules[name])
  File "<frozen importlib._bootstrap>", line 626, in _exec
  File "<frozen importlib._bootstrap_external>", line 673, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/tmp/ansible_command_payload_afjk26dr/__main__.py", line 327, in <module>
  File "/tmp/ansible_command_payload_afjk26dr/__main__.py", line 228, in main
  File "/tmp/ansible_command_payload_afjk26dr/ansible_command_payload.zip/ansible/module_utils/basic.py", line 691, in __init__
  File "/tmp/ansible_command_payload_afjk26dr/ansible_command_payload.zip/ansible/module_utils/basic.py", line 1940, in _log_invocation
  File "/tmp/ansible_command_payload_afjk26dr/ansible_command_payload.zip/ansible/module_utils/basic.py", line 1898, in log
  File "systemd/_journal.pyx", line 68, in systemd._journal.send
  File "systemd/_journal.pyx", line 32, in systemd._journal._send
ValueError: Key name may not begin with an underscore

fatal: [pi]: FAILED! => {
    "changed": false,
    "module_stderr": "Traceback (most recent call last):\n  File \"<stdin>\", line 114, in <module>\n  File \"<stdin>\", line 106, in _ansiballz_main\n  File \"<stdin>\", line 49, in invoke_module\n  File \"/usr/lib/python3.5/imp.py\", line 234, in load_module\n    return load_source(name, filename, file)\n  File \"/usr/lib/python3.5/imp.py\", line 170, in load_source\n    module = _exec(spec, sys.modules[name])\n  File \"<frozen importlib._bootstrap>\", line 626, in _exec\n  File \"<frozen importlib._bootstrap_external>\", line 673, in exec_module\n  File \"<frozen importlib._bootstrap>\", line 222, in _call_with_frames_removed\n  File \"/tmp/ansible_command_payload_afjk26dr/__main__.py\", line 327, in <module>\n  File \"/tmp/ansible_command_payload_afjk26dr/__main__.py\", line 228, in main\n  File \"/tmp/ansible_command_payload_afjk26dr/ansible_command_payload.zip/ansible/module_utils/basic.py\", line 691, in __init__\n  File \"/tmp/ansible_command_payload_afjk26dr/ansible_command_payload.zip/ansible/module_utils/basic.py\", line 1940, in _log_invocation\n  File \"/tmp/ansible_command_payload_afjk26dr/ansible_command_payload.zip/ansible/module_utils/basic.py\", line 1898, in log\n  File \"systemd/_journal.pyx\", line 68, in systemd._journal.send\n  File \"systemd/_journal.pyx\", line 32, in systemd._journal._send\nValueError: Key name may not begin with an underscore\n",
    "module_stdout": "",
    "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error",
    "rc": 1
}
```
if isinstance(args, (binary_type, text_type)):
                
                
                if PY2:
                    args = to_bytes(args, errors='surrogate_or_strict')
                elif PY3:
                    args = to_text(args, errors='surrogateescape')
                args = shlex.split(args)
            
            if expand_user_and_vars:
                args = [to_bytes(os.path.expanduser(os.path.expandvars(x)), errors='surrogate_or_strict') for x in args if x is not None]
            else:
                args = [to_bytes(x, errors='surrogate_or_strict') for x in args if x is not None]
        prompt_re = None
        if prompt_regex:
            if isinstance(prompt_regex, text_type):
                if PY3:
                    prompt_regex = to_bytes(prompt_regex, errors='surrogateescape')
                elif PY2:
                    prompt_regex = to_bytes(prompt_regex, errors='surrogate_or_strict')
            try:
                prompt_re = re.compile(prompt_regex, re.MULTILINE)
            except re.error:
                self.fail_json(msg="invalid prompt regular expression given to run_command")
        rc = 0
        msg = None
        st_in = None
        
        old_env_vals = {}