F #6052: Enable SSH forward

Hypervisor needs to ssh the BRIDGE to initiate some backup operations. SSH
forwarding needs to be enable in these operations.

(cherry picked from commit 36918fd)

Author: rsmontero

src/tm_mad/ceph/prebackup

@@ -67,6 +67,7 @@ script = vm.backup_disks_sh(:disks       => disks,
 
 rc = action.ssh(:host => rhost,
                 :cmds => script,
+                :forward  => true,
                 :nostdout => false,
                 :nostderr => false)
 

src/tm_mad/ceph/prebackup_live

@@ -68,6 +68,7 @@ script = vm.backup_disks_sh(:disks       => disks,
 
 rc = action.ssh(:host => rhost,
                 :cmds => script,
+                :forward  => true,
                 :nostdout => false,
                 :nostderr => false)