Remove unnecessary ceilometer service overrides

The ceilometer services were removed from core devstack a long ago[1].
Unless the additional plugins are installed, overriding status of
the ceilometer services is just useless.

[1] e9a4750fe1b111eeb457378c26ca9eea1b5e0085

Change-Id: I35848c8041b22ab5fcf041f3561dbd11d33fe555
1 file changed