standardize environmental settings for cli auth
standardize environmental settings for cli auth

a first pass at common configuration between cli tools
https://blueprints.launchpad.net/openstack-common/+spec/cli-auth

Change-Id: Ie1354268ef647fb265ad9f30e730ddcac990e7f7

guptaankita/python-novaclient,citrix-openstack-build/python-novaclient,takeshineshiro/python-novaclient,CCI-MOC/python-novaclient,Shihta/python-novaclient,JioCloud/python-novaclient,guptaankita/python-novaclient,mat128/python-novaclient,CCI-MOC/python-novaclient,takeshineshiro/python-novaclient,ntt-sic/python-novaclient,akash1808/python-novaclient,akash1808/python-novaclient,ntt-sic/python-novaclient,citrix-openstack-build/python-novaclient,metacloud/python-novaclient,Shihta/python-novaclient,mat128/python-novaclient,JioCloud/python-novaclient,metacloud/python-novaclient