Remove dangling -debug* RPMs from final MMD
If an RPM is not included, its correspnding -debug* RPMs should also not
be included.
Also ensure that source RPMs are only ever added to -devel modules if
a binary RPM has been completely excluded from non-devel module.
Internal ref: FACTORY-3263
Signed-off-by: Luiz Carvalho <lucarval@redhat.com>