probe: stop calling 'weave ps'

Now that we enter the container namespace to fetch IPs for every
container, there is no need to have 'weave ps' do it.

This does mean we lose Weave MAC addresses, but that is a rather
idiosyncratic feature anyway.

test/weave/mock.go

@@ -12,8 +12,6 @@ const (
 	MockWeavePeerNickName  = "winny"
 	MockWeaveDefaultSubnet = "10.32.0.1/12"
 	MockContainerID        = "83183a667c01"
-	MockContainerMAC       = "d6:f2:5a:12:36:a8"
-	MockContainerIP        = "10.0.0.123"
 	MockHostname           = "hostname.weave.local"
 	MockProxyAddress       = "unix:///foo/bar/weave.sock"
 	MockDriverName         = "weave_mock"
@@ -70,17 +68,6 @@ func (MockClient) AddDNSEntry(fqdn, containerid string, ip net.IP) error {
 	return nil
 }
 
-// PS implements weave.Client
-func (MockClient) PS() (map[string]weave.PSEntry, error) {
-	return map[string]weave.PSEntry{
-		MockContainerID: {
-			ContainerIDPrefix: MockContainerID,
-			MACAddress:        MockContainerMAC,
-			IPs:               []string{MockContainerIP},
-		},
-	}, nil
-}
-
 // Expose implements weave.Client
 func (MockClient) Expose() error {
 	return nil