Load conf from /usr/share/abrt/conf.d and /etc/abrt

Related to #752

Signed-off-by: Jakub Filak <jfilak@redhat.com>
spec: install conf to /usr/share/abrt/conf.d

Closes #752

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Merge branch 'gh752'