Overrides had no "cp", the connection was named uep

Updated Overrides to get a new connection from the provider
every time, this will avoid holding on to stale connections
in places like managergui, where the Overrides object is
created in the gui constructor.
Merge pull request #936 from candlepin/ckozak/fix_repo_overrides

Overrides had no "cp", the connection was named uep