Testing method for LBaaS update status() is partially wrong

In testing class of the db_loadbalancer (\neutron\tests\unit\db\loadbalancer\test_db_loadbalancer.py)
is a method testing the update_status functionality, test_update_status().

The last line of the test is checking that status description was cleared
after invoking the update_status() without description parameter.

The problem is that assert checks the pool object (the original object after creation)
instead of updated_pool object which was retrieved after the update_status() invocation.

That causes the last assert to always succeed.

Suggestion for fix:
Use the updated_pool object in assertFalse(),
e.g. self.assertFalse(updated_pool['status_description'])