Fix snapcast uuid to be more unique

Current uuid is ok when using only 1 snapserver
New uuid is needed when using multiple snapserver

Because the client can connect to more snapservers and
then uuid based on client MAC is not enough

homeassistant/components/media_player/snapcast.py

@@ -107,12 +107,14 @@ def state(self):
     @property
     def unique_id(self):
         """Return the ID of snapcast group."""
-        return '{}{}'.format(GROUP_PREFIX, self._group.identifier)
+        return '{}{}_{}'.format(GROUP_PREFIX, self._group._server._host,
+                                self._group.identifier)
 
     @property
     def name(self):
         """Return the name of the device."""
-        return '{}{}'.format(GROUP_PREFIX, self._group.identifier)
+        return '{}{}_{}'.format(GROUP_PREFIX, self._group._server._host,
+                                self._group.identifier)
 
     @property
     def source(self):
@@ -192,13 +194,19 @@ def __init__(self, client):
 
     @property
     def unique_id(self):
-        """Return the ID of this snapcast client."""
-        return '{}{}'.format(CLIENT_PREFIX, self._client.identifier)
+        """
+        Return the ID of this snapcast client.
+
+        Note: Host part is needed, when using multiple snapservers
+        """
+        return '{}{}_{}'.format(CLIENT_PREFIX, self._client._server._host,
+                                self._client.identifier)
 
     @property
     def name(self):
         """Return the name of the device."""
-        return '{}{}'.format(CLIENT_PREFIX, self._client.identifier)
+        return '{}{}_{}'.format(CLIENT_PREFIX, self._client._server._host,
+                                self._client.identifier)
 
     @property
     def volume_level(self):