Revert 4d529b75857597dedd181045ba1bf97b99c66b3e.

Turns out, that was a terrible idea.

Putting privilegedactions in actions/ meant that we tried to interpret
it during startup (along with other similarly silly bugs).  The
fastest way to fix this issue is to merely revert it.
Unify git.sample.config and git.sample.fhs.config.

There's no point to having two copies of what's essentially the same
file.  In the long term, this means the distributions will need to
patch out cfg.py directories instead of plinth.sample.fhs.config.  So,
if diff plinth.sample.config plinth.sample.fhs.config reveals
anything relevant, put that in your patch.