Fix comparison of priority (#43329)

The existing rule priority comes from aws as a string. It is then
compared to the new rule priority, which is defined as an int. This change
casts the new rule priority as a string making the comparison work. The
reason to cast it as a string rather than an int is used because a priority
can also be set to 'default'. When trying to case 'default' as an int, it creates
an error.

lib/ansible/module_utils/aws/elbv2.py

@@ -688,7 +688,7 @@ class ELBListenerRules(object):
         for current_rule in self.current_rules:
             current_rule_passed_to_module = False
             for new_rule in self.rules[:]:
-                if current_rule['Priority'] == new_rule['Priority']:
+                if current_rule['Priority'] == str(new_rule['Priority']):
                     current_rule_passed_to_module = True
                     # Remove what we match so that what is left can be marked as 'to be added'
                     rules_to_add.remove(new_rule)