set api.extensions logging to ERROR in unit tests
set api.extensions logging to ERROR in unit tests

neutron.api.extensions generates a lot of output in a normal
unit test run. It's responsible for > 80% of the lines in the
subunit_log.txt. Logging each file load 10k times slows everything
down, takes up valuable memory, and doesn't really help with testing.

Instead we can set this to ERROR level in a fixture to ignore most
of that logging and help make the unit tests run faster.

Change-Id: I86b41f20342b4080859ee036220ddffa200f0562

paninetworks/neutron,cernops/neutron,jerryz1982/neutron,CiscoSystems/neutron,projectcalico/calico-neutron,magic0704/neutron,takeshineshiro/neutron,leeseulstack/openstack,skyddv/neutron,shahbazn/neutron,MaximNevrov/neutron,eonpatapon/neutron,mandeepdhami/neutron,klmitch/neutron,gopal1cloud/neutron,rdo-management/neutron,vveerava/Openstack,virtualopensystems/neutron,jacknjzhou/neutron,barnsnake351/neutron,vveerava/Openstack,JianyuWang/neutron,antonioUnina/neutron,Stavitsky/neutron,bigswitch/neutron,eayunstack/neutron,leeseulstack/openstack,bigswitch/neutron,SmartInfrastructures/neutron,javaos74/neutron,NeCTAR-RC/neutron,jacknjzhou/neutron,cloudbase/neutron-virtualbox,leeseuljeong/leeseulstack_neutron,openstack/neutron,paninetworks/neutron,cloudbase/neutron-virtualbox,klmitch/neutron,mmnelemane/neutron,openstack/neutron,cloudbase/neutron,JioCloud/neutron,igor-toga/local-snat,virtualopensystems/neutron,sebrandon1/neutron,dhanunjaya/neutron,MaximNevrov/neutron,alexandrucoman/vbox-neutron-agent,SamYaple/neutron,vivekanand1101/neutron,blueboxgroup/neutron,projectcalico/calico-neutron,wolverineav/neutron,mattt416/neutron,noironetworks/neutron,aristanetworks/neutron,adelina-t/neutron,bgxavier/neutron,vivekanand1101/neutron,eayunstack/neutron,SmartInfrastructures/neutron,apporc/neutron,vbannai/neutron,openstack/neutron,dhanunjaya/neutron,mahak/neutron,gkotton/neutron,yuewko/neutron,gopal1cloud/neutron,chitr/neutron,bgxavier/neutron,leeseuljeong/leeseulstack_neutron,JianyuWang/neutron,CiscoSystems/neutron,yamahata/tacker,asgard-lab/neutron,blueboxgroup/neutron,rdo-management/neutron,noironetworks/neutron,alexandrucoman/vbox-neutron-agent,eonpatapon/neutron,dims/neutron,igor-toga/local-snat,Stavitsky/neutron,magic0704/neutron,suneeth51/neutron,sasukeh/neutron,jerryz1982/neutron,suneeth51/neutron,vbannai/neutron,Metaswitch/calico-neutron,watonyweng/neutron,javaos74/neutron,antonioUnina/neutron,gkotton/neutron,neoareslinux/neutron,cisco-openstack/neutron,cloudbase/neutron,SamYaple/neutron,infobloxopen/neutron,leeseuljeong/leeseulstack_neutron,miyakz1192/neutron,mmnelemane/neutron,glove747/liberty-neutron,jumpojoy/neutron,pnavarro/neutron,yanheven/neutron,redhat-openstack/neutron,yanheven/neutron,gkotton/neutron,waltBB/neutron_read,yamahata/tacker,cisco-openstack/neutron,wolverineav/neutron,silenci/neutron,CiscoSystems/neutron,glove747/liberty-neutron,barnsnake351/neutron,chitr/neutron,jumpojoy/neutron,JioCloud/neutron,wenhuizhang/neutron,watonyweng/neutron,sasukeh/neutron,huntxu/neutron,yamahata/tacker,NeCTAR-RC/neutron,yuewko/neutron,redhat-openstack/neutron,leeseulstack/openstack,silenci/neutron,pnavarro/neutron,swdream/neutron,skyddv/neutron,miyakz1192/neutron,asgard-lab/neutron,takeshineshiro/neutron,vveerava/Openstack,neoareslinux/neutron,adelina-t/neutron,apporc/neutron,huntxu/neutron,mandeepdhami/neutron,mahak/neutron,dims/neutron,blueboxgroup/neutron,mattt416/neutron,mahak/neutron,sebrandon1/neutron,wenhuizhang/neutron,waltBB/neutron_read,swdream/neutron,virtualopensystems/neutron,Metaswitch/calico-neutron,cernops/neutron,infobloxopen/neutron,aristanetworks/neutron,shahbazn/neutron,vbannai/neutron