Move gerrit fetch remotes to jeepyb
Move gerrit fetch remotes to jeepyb

As gerrit can be run without jeepyb, there
is no point on having the logic there. Move
everything to jeepyb, but leaving this class
with the gerrit related content.

Change-Id: I4d90513c3fac6632fcf832564b8763a38274398f

dhiana/puppet-gerrit,dhiana/puppet-gerrit,dhiana/puppet-gerrit