This is needed because not just the cli scripts need this decorator, but
the master daemon too (and it already duplicated the code once).

In cli.py we just leave a stub, so that we don't have to modify all the
scripts to import rpc.py.

We then change the master daemon code to reuse this decorator, instead
of duplicating it.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>