Fix for incorect capacity displayed at the db.

Conflicts:
	engine/schema/src/com/cloud/capacity/dao/CapacityDaoImpl.java
	server/src/com/cloud/alert/AlertManagerImpl.java
	server/src/com/cloud/api/ApiResponseHelper.java
CLOUDSTACK-3902: createVpcOffering - throw an excpetion when sourceNat service is not passed in
Summary: Fix null pointer and op_networks blocker to account cleanup

Detail: Accounts can fail in cleanup/gc process due to inconsistent op_networks
table and null pointer in looking up account for event publishing.

BUG-ID: CLOUDSTACK-3957
Signed-off-by: Marcus Sorensen <marcus@betterservers.com> 1375204815 -0600