As we now store ContainerInfo objects in OICodeGen::Config, we can not
copy it any more. Change all places that took copies to take const
references instead.
The copy in OICodeGen modified membersToStub, the contents of which form
part of OICache's hash. However, as OICache also previously had its own
copy, it would not have been OICodeGen's modifications.
It was previously easy to miss modules and I haven't been able to notice
any difference in behaviour when setting the VLOG level globally
(despite what the old comment says).
