ceph.spec.in: We no longer need redhat-lsb-core

ceph.spec.in: We no longer need redhat-lsb-core

Drop the redhat-lsb-core dependency as it is no longer necessary on
fedora/rhel.

The other two init scripts do not use redhat-lsb-core either. The
init-ceph.in conditionally requires /lib/lsb/init-functions and does not
use any of the functions defined in that file (at least not directly).
The init-radosgw file includes /etc/rc.d/init.d/functions on non-debian
platforms instead of /lib/lsb/init-functions file so it does not require
redhat-lsb-core either.

Signed-off-by: Boris Ranto <branto@redhat.com>