test: fix test_ha_multiple_mgmt_server_ownership in test_hostha_simulator.py

this fixes the test failure below
```
======================================================================
FAIL: Tests ha resource ownership expiry across multi-mgmt server
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/test/integration/smoke/test_hostha_simulator.py", line 462, in test_ha_multiple_mgmt_server_ownership
    self.fail("Management server failed to turn down or remove fake mgmt server")
AssertionError: Management server failed to turn down or remove fake mgmt server

----------------------------------------------------------------------
Ran 19 tests in 277.481s
```

Author: weizhouapache

test/integration/smoke/test_hostha_simulator.py

@@ -457,7 +457,7 @@ def checkHaOwnershipExpiry(fakeMsId):
 
         retry_interval = 1 + (pingInterval * pingTimeout / 10)
 
-        res, _ = wait_until(retry_interval, 20, removeFakeMgmtServer, self.getFakeMsRunId())
+        res, _ = wait_until(retry_interval, 100, removeFakeMgmtServer, self.getFakeMsRunId())
         if not res:
             self.fail("Management server failed to turn down or remove fake mgmt server")