When doing bulk security group rule create, the API replay process
need to take into account that rules within a security group might
belong to different tenants, and all the rules submitted in a bulk
operation must belong to the same tenant.
Also, fix typo as datetime has no 'elapsed' member, we should have
called now()
Change-Id: I5a11e2b7eb1d07b4aafd0798533fc19c1463f868