Add exception & gettextutils to openstack.common

These 2 modules are useful for cleaning up of the exceptions hierarchy.

Change-Id: I0bb84e1969523be2eea077711acc5702bc63b023
Don't query the agent with name

Bug #1160332

Change-Id: I4da1df900ff29f75e11b91186200d7841602bff4
Update --remote-group-id metavar to REMOTE_GROUP

The metavar value for --remote-group-id was left out in the patch
that renamed source_(group_id|ip_prefix) to remote. This patch
renames this instance of SOURCE to REMOTE.

Change-Id: I99d538e1cdc0b29e62b499c9c8ba8b3a31d77f7a
Merge "Don't query the agent with name"
Merge "Add exception & gettextutils to openstack.common"