Makefile: Disabling debian 9 support temporarly
Makefile: Disabling debian 9 support temporarly

The current status of the Debian port is broken and blocks all the other builds.

Debian is unable to find the nfs-ganesha-rgw package :
    Unable to locate package nfs-ganesha-rgw

Signed-off-by: Erwan Velu <dbf153a4f846e5c13692f4d75719ee25e7660abd@redhat.com>

ceph/ceph-docker,ceph/ceph-docker