howto/ganeti: tpo-create-san-disks does the rescan

and puppet itself takes care of reloading multipath when adding a new
alias

howto/ganeti.md

@@ -194,7 +194,7 @@ the [storage servers documentation](howto/new-machine-cymru#storage-servers) for
 
  3. propagate the magic to all nodes in the cluster:
 
-        gnt-cluster command "puppet agent -t ; iscsiadm -m node --rescan ; multipath -r"
+        gnt-cluster command "puppet agent -t"
 
  4. confirm that multipath works, it should look something like this":