add support for hostname on Raspbian

[smueller18]

SUMMARY

This PR adds support for the hostname module on Raspbian

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

hostname

ADDITIONAL INFORMATION

So far, the hostname module does not work on Raspbian:

TASK [network : Set hostname] ***********************************************************************************************************************************************************
fatal: [localhost]: FAILED! => {"changed": false, "msg": "hostname module cannot be used on platform Linux (Raspbian gnu/linux)"}

After testing the code change, I get the following output:

TASK [network : Set hostname] ***********************************************************************************************************************************************************
ok: [localhost]

[ansibot]

cc @alikins @saito-hideki
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