rpm: remove useless provides for xlator .so files and private libraries

xlator .so files and private libraries should be skipped while scanning
for provides:
- https://fedoraproject.org/wiki/Packaging:AutoProvidesAndRequiresFiltering

This prevents automatic generated provides like these in the glusterfs,
glustrefs-fuse and glusterfs-server packages:
- addr.so.0()(64bit)
- afr.so.0()(64bit)
- client.so.0()(64bit)
- dht.so.0()(64bit)
- ...

BUG: 952122
Change-Id: Icd08925eb1826f3593129e7c19de83528f7b6301
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/4823
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>