packaging: spec: cleanup dependencies

bind-utils, cracklib-python, policycoreutils-python required for
setup and no other.

httpd, mod_ssl required by backend.

all in one needs recent setup.

Change-Id: Iba2977ed8d151af9dbefc75849e9f37d1540a3a8
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>