Remove unavailable gstreamer packages

Remove gstreamer0.10-plugins-bad and gstreamer0.10-plugins-ugly.
The packages have no installation candidate. This may mean that the
packages are missing, have been obsoleted, or are only available from
another source.

gstreamer0.10-plugins-bad is replaced by gstreamer0.10-plugins-good and
gstreamer0.10-plugins-base.