Support uri and token

Signed-off-by: Kaiyuan.Hu <kaiyuan.hu@zilliz.com>

milvus_client.py

@@ -26,19 +26,24 @@ class MilvusClient(PyOperator):
     """
 
     def __init__(self, host: str = 'localhost', port: int = 19530, collection_name: str = None,
-                 user: str = None, password: str = None, **kwargs):
+                 uri: str = None, user: str = None, password: str = None, token: str = None, **kwargs):
         """
         Get an existing collection.
         """
         self._host = host
         self._port = port
+        self._uri = uri
         self._collection_name = collection_name
         self._connect_name = uuid.uuid4().hex
-        if None in [user, password]:
-            connections.connect(alias=self._connect_name, host=self._host, port=self._port)
-        else:
+        if uri and token:
+            connections.connect(alias=self._connect_name, uri=self._uri, token=token, secure=True)
+        elif user and password:
             connections.connect(alias=self._connect_name, host=self._host, port=self._port,
                                 user=user, password=password, secure=True)
+        else:
+            connections.connect(alias=self._connect_name, host=self._host, port=self._port)
+        
+    
         self._collection = Collection(self._collection_name, using=self._connect_name)      
 
         self.kwargs = kwargs