As runc uses the RPC interface to run criu it is necessary to expose
the newly added status-fd feature via RPC. Using the status-fd interface
makes it possible to use lazy migration with runc.

travis-ci: success for RPC: make status-fd option available via RPC (rev3)
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>