Update existing source based builds default to the master tarball

Change-Id: Icae917ba780d5b0dc8b7fffebb29018e51055985
Closes-Bug: #1476202

docker/centos/source/heat/heat-base/.buildinfo

@@ -7,4 +7,4 @@ SOURCE_INSTALL_AVAILABLE=1
 : ${CLONE_FROM:=https://github.com/openstack/heat}
 
 # Used for curl install method
-: ${TARBALL_URI:=http://tarballs.openstack.org/heat/heat-2015.1.0.tar.gz}
+: ${TARBALL_URI:=http://tarballs.openstack.org/heat/heat-master.tar.gz}

docker/centos/source/keystone/.buildinfo

@@ -7,4 +7,4 @@ SOURCE_INSTALL_AVAILABLE=1
 : ${CLONE_FROM:=https://github.com/openstack/keystone}
 
 # Used for curl install method
-: ${TARBALL_URI:=http://tarballs.openstack.org/keystone/keystone-2015.1.0.tar.gz}
+: ${TARBALL_URI:=http://tarballs.openstack.org/keystone/keystone-master.tar.gz}

docker/centos/source/magnum/magnum-base/.buildinfo

@@ -7,4 +7,4 @@ SOURCE_INSTALL_AVAILABLE=1
 : ${CLONE_FROM:=https://github.com/openstack/magnum}
 
 # Used for curl install method
-: ${TARBALL_URI:=http://tarballs.openstack.org/magnum/magnum-2015.1.1.tar.gz}
+: ${TARBALL_URI:=http://tarballs.openstack.org/magnum/magnum-master.tar.gz}

docker/centos/source/neutron/neutron-base/.buildinfo

@@ -8,4 +8,4 @@ SOURCE_INSTALL_AVAILABLE=1
 : ${CLONE_FROM:=https://github.com/openstack/neutron}
 
 # Used for curl install method
-: ${TARBALL_URI:=http://tarballs.openstack.org/neutron/neutron-2015.1.0.tar.gz}
+: ${TARBALL_URI:=http://tarballs.openstack.org/neutron/neutron-master.tar.gz}