Multiple ONOSCluster support for ONOSCLI

Previously we were only passing the first ONOSCluster
into MininetFacade, but lo and behold it supports as
many networks as you like! So we pass them all in the
case where we have multiple ONOSClusters.

Change-Id: If848886b958aa47d3e4834c44adc98fffd90453c
diff --git a/tools/dev/mininet/onos.py b/tools/dev/mininet/onos.py
index 3473434..1f69e0f 100755
--- a/tools/dev/mininet/onos.py
+++ b/tools/dev/mininet/onos.py
@@ -535,9 +535,9 @@
     prompt = 'mininet-onos> '
 
     def __init__( self, net, **kwargs ):
-        c0 = net.controllers[ 0 ]
-        if isONOSCluster( c0 ):
-            net = MininetFacade( net, cnet=c0.net )
+        clusters = [ c.net for c in net.controllers
+                     if isONOSCluster( c ) ]
+        net = MininetFacade( net, *clusters )
         OldCLI.__init__( self, net, **kwargs )
 
     def onos1( self ):