shadow tests: make work with main shadow branch

This is subject to change before the official Shadow 3.0 release,
but since it currently includes a patch set with a massive performance boon,
we're going to target the latest development head, and possibly just use that
if 3.0 doesn't release before we need it.

shadow/client/shadow.yaml

@@ -15,6 +15,7 @@ hosts:
     - path: mgen-server
       args: 100.0.0.1:6397
       start_time: 3s
+      expected_final_state: running
 
   client1: &client_host
     network_node_id: 0
@@ -22,5 +23,6 @@ hosts:
     - path: mgen-client
       args: "*.yaml"
       start_time: 5s
+      expected_final_state: running
   client2: *client_host
   client3: *client_host

shadow/peer/shadow.yaml

@@ -15,6 +15,7 @@ hosts:
     - path: mgen-peer
       args: "../hostsfile *.yaml"
       start_time: 5s
+      expected_final_state: running
   peer2:
     network_node_id: 0
     ip_addr: 100.0.0.2