Relax the update.py replace regex.
Relax the update.py replace regex.

In service.py there is an import like:
try:
    from openstack.common import rpc
except:
    rpc = None

and this currently does not get converted.
The only downside is some doc strings also get
converted.

Change-Id: If283b50b8e889c0a1878e30cd7ff58494fabe634

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator