Don't log ipam driver on every IP allocation
Don't log ipam driver on every IP allocation

We only support one driver right now so there isn't a point
in logging it for every single IP allocation call.

TrivialFix

Change-Id: Iebd753e9ca433227c9622227ba76a246b4fea2b3

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