Archlinux doesn't have an AIO installation so the puppet_gem provider
doesn't work. Using the regular gem provider should work. The
aio_agent_version fact is used to determine whether it's an AIO install.

Originally introduced in 63251bc.
However, on current Debian systems the /var/run/redis directory is no
longer shared. bc37527 took care of
that. The versions that affect are no longer from backports anyway.

Fixes: bc37527