Branch 2.7: TopicPoliciesTest.testMaxSubscriptionsFailFast fails

[eolivelli]

In branch-2.7 we have this commit that introduces TopicPoliciesTest.testMaxSubscriptionsFailFast.
The test is failing, probably due to a merge problem during the cherry-pick.

Author: feynmanlin <feynmanlin@tencent.com>
Date:   Tue Mar 23 11:56:15 2021 +0800

    Fix the useless retry when the maximum number of subscriptions is reached (#9991)
    
    When the maximum number of subscriptions is reached, due to the long default value of operationTimeout, the client will keep retrying and get stuck for a long time.
    If a NotAllowedException is returned, the client will not continue to retry and will fail directly.
    
    Can the test fail in a short time
    
    (cherry picked from commit 31c5fb52bc841e40d678bd3787269160b7d14c12)

[codelipenghui]

Yes, seems this is a cherry-pick issue