CBQE-0: Bug in basetestcase for services

Fix for the following issue

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ERROR: test_failover_normal (failover.failovertests.FailoverTests)
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Traceback (most recent call last):
  File "pytests/failover/failovertests.py", line 13, in setUp
    super(FailoverTests, self).setUp(self)
  File "pytests/failover/failoverbasetests.py", line 15, in setUp
    super(FailoverBaseTest, self).setUp()
  File "pytests/basetestcase.py", line 185, in setUp
    self.fail(e)
AssertionError: 'int' object is not iterable


Change-Id: I88df7ee9ccb4471f8ea9330e25751ebc41fa51d2
Reviewed-on: http://review.couchbase.org/44428
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>