[Merge] lp:~cwayne18/ubuntu/trusty/systemd/symlink-support-hostnamed into lp:ubuntu/systemd

[Chris Wayne]

Also, anything that's trying to /etc/hostname right now is failing anyway since it's R/O, so nothing should break there :)
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https://code.launchpad.net/~cwayne18/ubuntu/trusty/systemd/symlink-support-hostnamed/+merge/201540
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