<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
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##### SUMMARY
hostname module fails on linux pardus distributions.

##### 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 VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```
3.8.2
```

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

```

##### OS / ENVIRONMENT
Pardus Gnu/Linux 19.3


##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```
 - name: set hostname
    hostname:
      name: "pardus"
```

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

##### EXPECTED RESULTS
should set hostname on pardus as well


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

<!--- Paste verbatim command output between quotes -->
```
hostname module cannot be used on platform Linux (pardus)
```

OSDIST_LIST = (
        {'path': '/etc/oracle-release', 'name': 'OracleLinux'},
        {'path': '/etc/slackware-version', 'name': 'Slackware'},
        {'path': '/etc/redhat-release', 'name': 'RedHat'},
        {'path': '/etc/vmware-release', 'name': 'VMwareESX', 'allowempty': True},
        {'path': '/etc/openwrt_release', 'name': 'OpenWrt'},
        {'path': '/etc/system-release', 'name': 'Amazon'},
        {'path': '/etc/alpine-release', 'name': 'Alpine'},
        {'path': '/etc/arch-release', 'name': 'Archlinux', 'allowempty': True},
        {'path': '/etc/os-release', 'name': 'SUSE'},
        {'path': '/etc/SuSE-release', 'name': 'SUSE'},
        {'path': '/etc/gentoo-release', 'name': 'Gentoo'},
        {'path': '/etc/os-release', 'name': 'Debian'},
        {'path': '/etc/lsb-release', 'name': 'Mandriva'},
        {'path': '/etc/altlinux-release', 'name': 'Altlinux'},
        {'path': '/etc/sourcemage-release', 'name': 'SMGL'},
        {'path': '/usr/lib/os-release', 'name': 'ClearLinux'},
        {'path': '/etc/coreos/update.conf', 'name': 'Coreos'},
        {'path': '/etc/flatcar/update.conf', 'name': 'Flatcar'},
        {'path': '/etc/os-release', 'name': 'NA'},
    )
    SEARCH_STRING = {
        'OracleLinux': 'Oracle Linux',
        'RedHat': 'Red Hat',
        'Altlinux': 'ALT Linux',
        'ClearLinux': 'Clear Linux Software for Intel Architecture',
        'SMGL': 'Source Mage GNU/Linux',