rpm: ceph-fuse requires fuse package

rpm: ceph-fuse requires fuse package

The ceph-fuse(8) man page describes using the "fusermount" tool to mount
CephFS. This utility is in the "fuse" package. Prior to this change, the
ceph-fuse RPM only depends on "fuse-libs", not "fuse".

The Debian packaging has always depended on the full "fuse" (previously
"fuse-utils") package, so we should make the RPM packaging do the same.

Fixes: http://tracker.ceph.com/issues/21057
Signed-off-by: Ken Dreyer <kdreyer@redhat.com>
(cherry picked from commit 6fba9cc3f910442d3d09b41f01f454a39bfdbc48)