Fixes map call usage

For the comparisions that need to be done, this map call needs
to convert to a list because the six import in ansible changes
the behavior of map to return an iterator instead of a list

lib/ansible/modules/network/f5/bigip_virtual_server.py

@@ -250,7 +250,7 @@ def set_rules(api, name, rules_list):
         return False
     rules_list = list(enumerate(rules_list))
     try:
-        current_rules = map(lambda x: (x['priority'], x['rule_name']), get_rules(api, name))
+        current_rules = [(x['priority'], x['rule_name']) for x in get_rules(api, name)]
         to_add_rules = []
         for i, x in rules_list:
             if (i, x) not in current_rules: