Removed is_deadlock from db/api
Removed is_deadlock from db/api

Marked as deprecated in Change I151ffcf47926f5ac66e452974f87e8bc2a906151
Use is_retriable instead of is_deadlock.

Change-Id: I895d288c2fcbb225ac2c116f378fbbb43b052549

noironetworks/neutron,huntxu/neutron,noironetworks/neutron,eayunstack/neutron,openstack/neutron,openstack/neutron,cloudbase/neutron,cloudbase/neutron,huntxu/neutron,eayunstack/neutron,mahak/neutron,mahak/neutron,mahak/neutron,openstack/neutron