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##### SUMMARY
<!--- Explain the problem briefly below -->
The word "ERROR" in an IOS log message causes terminal to parse an error. IOS_command modules doesn't register stdout, only the one line of log output with the word "Error" as stderr. Task fails.
##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
I'm using ios_command module, however, I believe the ios terminal plugin has the regex to parse stderr.  ansible/lib/ansible/plugins/terminal/ios.py 
##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
Using 2.7.7. Difficult to copy and paste due to locked down environment.
```

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

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Ubuntu 16.04.6

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Use ios_command module to show logs in buffer on the device. Register the output as a variable. Debug the contents of the variable. If a line of logs contains the word "ERROR", the task will fail and stdout will be empty.

Actual log lines that have triggered this:
%IPSEC-3-REPLAY_ERROR: IPSec SA recieves anti-replay error, DP Handle 549, src_addr x.x.x.x, dest_addr y.y.y.y, SPI...

ISAKMP-ERROR: (0):Failed to find peer index node to update peer_info_list

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- tasks
  ios_command:
    commands: show logging
  register: logs
```

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

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
Lines of logs registered in variable.stdout.

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
Variable has no stdout, only stderr. Stderr is only the one line of logs that contained the word "ERROR".
<!--- Paste verbatim command output between quotes -->
```paste below

```

vars:
      - name: ansible_password
      - name: ansible_ssh_pass
      - name: ansible_ssh_password
  private_key_file:
    description:
      - The private SSH key or certificate file used to authenticate to the
        remote device when first establishing the SSH connection.
    ini:
      - section: defaults
        key: private_key_file
    env:
      - name: ANSIBLE_PRIVATE_KEY_FILE
    vars:
      - name: ansible_private_key_file
  timeout:
    type: int
    description:
      - Sets the connection time, in seconds, for communicating with the
        remote device.  This timeout is used as the default timeout value for
        commands when issuing a command to the network CLI.  If the command
        does not return in timeout seconds, an error is generated.
    default: 120
  become:
    type: boolean
    description:
      - The become option will instruct the CLI session to attempt privilege
        escalation on platforms that support it.  Normally this means
        transitioning from user mode to C(enable) mode in the CLI session.
        If become is set to True and the remote device does not support