Logging module cleanup
Logging module cleanup

Replaced logging with openstack.common.log
Removed imports where logging is not used

Fixes bug #1095541

Change-Id: I5b03d9697dde3ef3520f67d1d8166f7af7689551

gotostack/neutron-lbaas,gandelman-a/neutron-lbaas,gandelman-a/neutron-lbaas,citrix-openstack-build/neutron-vpnaas,FedericoRessi/networking-odl,CiscoSystems/networking-odl,CiscoSystems/networking-odl,dougwig/x-neutron-vpnaas,openstack/neutron-vpnaas,schoksey/networking-odl,citrix-openstack-build/neutron-lbaas,FedericoRessi/networking-odl,schoksey/networking-odl,openstack/networking-odl,gaolichuang/neutron-fwaas,dougwig/x-neutron-lbaas,citrix-openstack-build/neutron-fwaas,gaolichuang/neutron-fwaas,dougwig/x-neutron-fwaas,gotostack/neutron-lbaas,openstack/networking-odl,openstack/neutron-vpnaas,openstack/neutron-fwaas,openstack/networking-odl,openstack/neutron-fwaas,flavio-fernandes/networking-odl,mestery/x-stackforge-odl,gotostack/neutron-lbaas,flavio-fernandes/networking-odl,gandelman-a/neutron-lbaas