Decode byte encoded response from redis before printing (#71)

* Decode byte encoded response from redis before printing
In py3, the response from redis connector is encoded as byte array. They
need to be decoded before accessing them as strings.
* Always decode byte responses from redis

src/swsssdk/scripts/sonic-db-cli

@@ -57,11 +57,11 @@ def handle_all_instances(namespace, op, use_unix_socket=False):
 def execute_cmd(dbname, cmd, namespace, use_unix_socket=False):
     if namespace is None:
         if use_unix_socket:
-            dbconn = swsssdk.SonicV2Connector(use_unix_socket_path=True)
+            dbconn = swsssdk.SonicV2Connector(use_unix_socket_path=True, decode_responses=True)
         else:
-            dbconn = swsssdk.SonicV2Connector(use_unix_socket_path=False)
+            dbconn = swsssdk.SonicV2Connector(use_unix_socket_path=False, decode_responses=True)
     else:
-        dbconn = swsssdk.SonicV2Connector(use_unix_socket_path=True, namespace=namespace)
+        dbconn = swsssdk.SonicV2Connector(use_unix_socket_path=True, namespace=namespace, decode_responses=True)
     try:
         dbconn.connect(dbname)
     except RuntimeError: