[autotest] Reroute some RPCs called to a shard to master

create_job and create_suite_job RPCs should not be handled by a shard.
They should be redirected to the master.

BUG=chromium:503188
TEST=puppylab. Submit a dummy suite in a stumpy shard.

Change-Id: Ibe432655c677024e9eee1f4aca118ef6db7951f7
Reviewed-on: https://chromium-review.googlesource.com/281818
Reviewed-by: Mungyung Ryu <mkryu@google.com>
Commit-Queue: Mungyung Ryu <mkryu@google.com>
Tested-by: Mungyung Ryu <mkryu@google.com>

frontend/afe/rpc_interface_unittest.py

diff --git a/frontend/afe/rpc_interface_unittest.py b/frontend/afe/rpc_interface_unittest.py
index 14c1c5a..d74463a 100755
--- a/frontend/afe/rpc_interface_unittest.py
+++ b/frontend/afe/rpc_interface_unittest.py
@@ -220,8 +220,9 @@
 
 
     def _create_job_helper(self, **kwargs):
-        return rpc_interface.create_job('test', 'Medium', 'control file',
-                                        SERVER, **kwargs)
+        return rpc_interface.create_job(name='test', priority='Medium',
+                                        control_file='control file',
+                                        control_type=SERVER, **kwargs)
 
 
     def test_one_time_hosts(self):