DB: remove method _get_tenant_id_for_create
DB: remove method _get_tenant_id_for_create

This method was marked as deprecated in commit 584d960a93a5ee278fd2c79887cd96da224e8fc5.

TrivialFix

Change-Id: Id753df324eb2df938fbce5a0e033768f3a11de11

igor-toga/local-snat,cloudbase/neutron,noironetworks/neutron,wolverineav/neutron,huntxu/neutron,mahak/neutron,sebrandon1/neutron,cloudbase/neutron,openstack/neutron,noironetworks/neutron,bigswitch/neutron,eayunstack/neutron,igor-toga/local-snat,klmitch/neutron,wolverineav/neutron,openstack/neutron,bigswitch/neutron,eayunstack/neutron,klmitch/neutron,mahak/neutron,openstack/neutron,huntxu/neutron,MaximNevrov/neutron,mahak/neutron,MaximNevrov/neutron,sebrandon1/neutron