<!--- 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
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)
```

}
    
    OS_FAMILY_MAP = {'RedHat': ['RedHat', 'Fedora', 'CentOS', 'Scientific', 'SLC',
                                'Ascendos', 'CloudLinux', 'PSBM', 'OracleLinux', 'OVS',
                                'OEL', 'Amazon', 'Virtuozzo', 'XenServer', 'Alibaba',
                                'EulerOS', 'openEuler'],
                     'Debian': ['Debian', 'Ubuntu', 'Raspbian', 'Neon', 'KDE neon',
                                'Linux Mint', 'SteamOS', 'Devuan', 'Kali', 'Cumulus Linux',
                                'Pop!_OS', 'Parrot'],
                     'Suse': ['SuSE', 'SLES', 'SLED', 'openSUSE', 'openSUSE Tumbleweed',
                              'SLES_SAP', 'SUSE_LINUX', 'openSUSE Leap'],
                     'Archlinux': ['Archlinux', 'Antergos', 'Manjaro'],
                     'Mandrake': ['Mandrake', 'Mandriva'],
                     'Solaris': ['Solaris', 'Nexenta', 'OmniOS', 'OpenIndiana', 'SmartOS'],
                     'Slackware': ['Slackware'],
                     'Altlinux': ['Altlinux'],
                     'SGML': ['SGML'],
                     'Gentoo': ['Gentoo', 'Funtoo'],
                     'Alpine': ['Alpine'],
                     'AIX': ['AIX'],
                     'HP-UX': ['HPUX'],
                     'Darwin': ['MacOSX'],
                     'FreeBSD': ['FreeBSD', 'TrueOS'],
                     'ClearLinux': ['Clear Linux OS', 'Clear Linux Mix'],
                     'DragonFly': ['DragonflyBSD', 'DragonFlyBSD', 'Gentoo/DragonflyBSD', 'Gentoo/DragonFlyBSD']}
    OS_FAMILY = {}
    for family, names in OS_FAMILY_MAP.items():
        for name in names:
            OS_FAMILY[name] = family
    def __init__(self, module):