Avoid env variable duplication in tox.ini
Avoid env variable duplication in tox.ini

Some environment variables are defined multiple times in tox.ini. This
change defines "fake" tox jobs and refactors existing jobs to reduce
duplicated environment variables.

Change-Id: I0ccebea4fbfff8dda34d1ed348b96b3b8ebd59e2

MaximNevrov/neutron,vivekanand1101/neutron,huntxu/neutron,cisco-openstack/neutron,noironetworks/neutron,neoareslinux/neutron,mmnelemane/neutron,mattt416/neutron,mmnelemane/neutron,suneeth51/neutron,eayunstack/neutron,barnsnake351/neutron,sasukeh/neutron,asgard-lab/neutron,jumpojoy/neutron,klmitch/neutron,apporc/neutron,mahak/neutron,noironetworks/neutron,dims/neutron,glove747/liberty-neutron,cloudbase/neutron,paninetworks/neutron,takeshineshiro/neutron,wolverineav/neutron,wenhuizhang/neutron,bigswitch/neutron,apporc/neutron,barnsnake351/neutron,eayunstack/neutron,vivekanand1101/neutron,paninetworks/neutron,eonpatapon/neutron,mandeepdhami/neutron,yanheven/neutron,wolverineav/neutron,suneeth51/neutron,cloudbase/neutron,openstack/neutron,asgard-lab/neutron,JianyuWang/neutron,chitr/neutron,swdream/neutron,SamYaple/neutron,javaos74/neutron,silenci/neutron,jacknjzhou/neutron,openstack/neutron,openstack/neutron,mandeepdhami/neutron,yanheven/neutron,jacknjzhou/neutron,watonyweng/neutron,igor-toga/local-snat,eonpatapon/neutron,takeshineshiro/neutron,wenhuizhang/neutron,jumpojoy/neutron,chitr/neutron,skyddv/neutron,swdream/neutron,dims/neutron,glove747/liberty-neutron,sasukeh/neutron,mahak/neutron,mahak/neutron,igor-toga/local-snat,cisco-openstack/neutron,sebrandon1/neutron,adelina-t/neutron,skyddv/neutron,shahbazn/neutron,silenci/neutron,dhanunjaya/neutron,JianyuWang/neutron,sebrandon1/neutron,mattt416/neutron,neoareslinux/neutron,huntxu/neutron,MaximNevrov/neutron,watonyweng/neutron,SamYaple/neutron,adelina-t/neutron,dhanunjaya/neutron,bigswitch/neutron,shahbazn/neutron,javaos74/neutron,klmitch/neutron