manila: Disable upload of service image
manila: Disable upload of service image

The cephfs_native driver CI does not need the service image that is
being uploaded. Disable the upload until a need arises, for example,
when the CI does scenario testing.

Change-Id: I1ed0af5fd61829a075a41df2939f0377deb351b3

ajarr/devstack-plugin-ceph,openstack/devstack-plugin-ceph