domainEventRegisterAny called too often

Changeid I090765802bfe443440f16722bc7c43b6280fe56a fixes
bug #1240905 but introduced a bug whereby domainEventRegisterAny
is called on every call to _get_connection.

Change-Id: Ifafc6a4c172b1521d62988ccbb3a2f51a95e323f
Fixes: bug #1250135
Merge "domainEventRegisterAny called too often"