replace type() with isinstance() (#3404)

Replace use of type() with isinstance()

Addresses https://github.com/ansible/ansible/issues/18310

lib/ansible/modules/extras/database/misc/redis.py

@@ -149,7 +149,7 @@ def set_master_mode(client):
 
 def flush(client, db=None):
     try:
-        if type(db) != int:
+        if not isinstance(db, int):
             return client.flushall()
         else:
             # The passed client has been connected to the database already