The "update apt cache" in the ceph-handler role was never called and the
handler trigger after adding the uca repository doesn't exist at all.
Instead of using a handler for that we can just set the update_cache
parameter to true like the other apt_repository tasks.

Resolve merge conflict from cherry-picking this commit.

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>