[BZ-1218962] log as error that we can't deploy MDS in RHEL yet
[BZ-1218962] log as error that we can't deploy MDS in RHEL yet

Signed-off-by: Alfredo Deza <3f4d00ffa77e6441ab2d23c25a618925d2383b02@redhat.com>

zhouyuan/ceph-deploy,isyippee/ceph-deploy,isyippee/ceph-deploy,SUSE/ceph-deploy,alfredodeza/ceph-deploy,osynge/ceph-deploy,codenrhoden/ceph-deploy,SUSE/ceph-deploy-to-be-deleted,SUSE/ceph-deploy,imzhulei/ceph-deploy,osynge/ceph-deploy,ghxandsky/ceph-deploy,ceph/ceph-deploy,imzhulei/ceph-deploy,ddiss/ceph-deploy,ddiss/ceph-deploy,branto1/ceph-deploy,ceph/ceph-deploy,Vicente-Cheng/ceph-deploy,trhoden/ceph-deploy,ghxandsky/ceph-deploy,Vicente-Cheng/ceph-deploy,trhoden/ceph-deploy,zhouyuan/ceph-deploy,shenhequnying/ceph-deploy,branto1/ceph-deploy,alfredodeza/ceph-deploy,SUSE/ceph-deploy-to-be-deleted,shenhequnying/ceph-deploy,codenrhoden/ceph-deploy