Add warning log when deprecated v2 and v3 code get used
Add warning log when deprecated v2 and v3 code get used

This patch adds warning log when deprecated v2 and v3 wsgi stack
running. It is good for notify user update their environment.

Change-Id: Ifce7ee1c97ef908bae56dbb72f79c39e3c8aa65e

dims/nova,sebrandon1/nova,rahulunair/nova,MountainWei/nova,CCI-MOC/nova,gooddata/openstack-nova,JianyuWang/nova,raildo/nova,BeyondTheClouds/nova,yosshy/nova,gooddata/openstack-nova,mahak/nova,bigswitch/nova,sebrandon1/nova,gooddata/openstack-nova,cloudbase/nova,felixma/nova,noironetworks/nova,devendermishrajio/nova,scripnichenko/nova,gooddata/openstack-nova,klmitch/nova,fnordahl/nova,dims/nova,phenoxim/nova,Juniper/nova,apporc/nova,hanlind/nova,BeyondTheClouds/nova,klmitch/nova,Juniper/nova,TwinkleChawla/nova,j-carpentier/nova,mahak/nova,openstack/nova,klmitch/nova,Juniper/nova,cyx1231st/nova,jianghuaw/nova,edulramirez/nova,jianghuaw/nova,rahulunair/nova,noironetworks/nova,mikalstill/nova,Francis-Liu/animated-broccoli,sebrandon1/nova,scripnichenko/nova,rajalokan/nova,zhimin711/nova,rajalokan/nova,devendermishrajio/nova,raildo/nova,rahulunair/nova,edulramirez/nova,alaski/nova,rajalokan/nova,vmturbo/nova,ted-gould/nova,j-carpentier/nova,vmturbo/nova,openstack/nova,jianghuaw/nova,cloudbase/nova,isyippee/nova,hanlind/nova,cernops/nova,openstack/nova,fnordahl/nova,vmturbo/nova,apporc/nova,mikalstill/nova,MountainWei/nova,rajalokan/nova,cloudbase/nova,Juniper/nova,ted-gould/nova,bigswitch/nova,isyippee/nova,CEG-FYP-OpenStack/scheduler,phenoxim/nova,hanlind/nova,klmitch/nova,TwinkleChawla/nova,mahak/nova,CEG-FYP-OpenStack/scheduler,zhimin711/nova,Francis-Liu/animated-broccoli,BeyondTheClouds/nova,alaski/nova,NeCTAR-RC/nova,yosshy/nova,cyx1231st/nova,mikalstill/nova,NeCTAR-RC/nova,felixma/nova,JianyuWang/nova,jianghuaw/nova,vmturbo/nova,CCI-MOC/nova,cernops/nova,cernops/nova