Update MURANO_REPO_URL
Update MURANO_REPO_URL

Updating MURANO_REPO_URL to 
http://apps.openstack.org/api/v1/murano_repo/liberty/

Depends-On: Icb869e9ac8e9795e93d8922600d900522b759e08
Change-Id: I8f7fe9c75798868d9bb435757c1a4d05841ccd63

openstack/python-muranoclient,openstack/python-muranoclient