Updated openstack/openstack
Project: openstack/ceilometer  013414fc388bda8c5d5eb20061623350243ad9cc

move db2 and mongo driver to event tree

this patch mves the event related code to the respective db2 and
mongo drivers in event tree

Change-Id: I1990f93143aae470fc9b70287c230260fef67b32
Partially-Implements: blueprint dedicated-event-db