ceph.spec.in:  Don't invoke debug_package macro on centos.

If the redhat-rpm-config package is installed, the debuginfo rpms will
be built by default.   The build will fail when the package installed
and the specfile also invokes the macro.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
ceph.spec.in:  remove trailing paren in previous commit

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>