Use constraints for releasenotes
Use constraints for releasenotes

OpenStack CI has now enabled constraints for releasenotes, use them -
remove the special install command.

Note that venv still cannot use constraints, this needs more changes
in OpenStack CI.

Change-Id: I125cb906f89c1de4227dc53521e1a60241ace997
Depends-On: If5d6b11bd795091eef949001cca6e8d4ec723ef2

klmitch/nova,Juniper/nova,mahak/nova,Juniper/nova,gooddata/openstack-nova,mikalstill/nova,Juniper/nova,rajalokan/nova,sebrandon1/nova,sebrandon1/nova,vmturbo/nova,mikalstill/nova,phenoxim/nova,Juniper/nova,openstack/nova,klmitch/nova,cloudbase/nova,rajalokan/nova,rahulunair/nova,sebrandon1/nova,vmturbo/nova,rajalokan/nova,jianghuaw/nova,mahak/nova,jianghuaw/nova,cloudbase/nova,gooddata/openstack-nova,cloudbase/nova,openstack/nova,rahulunair/nova,openstack/nova,klmitch/nova,rajalokan/nova,hanlind/nova,alaski/nova,klmitch/nova,jianghuaw/nova,hanlind/nova,rahulunair/nova,phenoxim/nova,vmturbo/nova,mahak/nova,vmturbo/nova,jianghuaw/nova,hanlind/nova,mikalstill/nova,gooddata/openstack-nova,gooddata/openstack-nova,alaski/nova