Add Test Suite finish compatibility for Xcode 6 beta 4

[FIXED JENKINS-24120]
Compatible for Xcode 5 and Xcode 6.

Xcode 5 Log:
Test Suite 'SCTests_ResultInterpreter' started at 2014-08-01 04:09:27 +0000
...
Test Suite 'SCTests_ResultInterpreter' finished at 2014-08-01 04:09:27 +0000.
Executed 24 tests, with 0 failures (0 unexpected) in 0.024 (0.025) seconds

Xcode 6 beta 4 log:
Test Suite 'SCTests_ResultInterpreter' started at 2014-07-31 23:23:19 +0000
...
Test Suite 'SCTests_ResultInterpreter' passed at 2014-07-31 23:23:19 +0000.
	 Executed 24 tests, with 0 failures (0 unexpected) in 0.031 (0.037) seconds

Notice that in Xcode 5, the test log for Test Suite is 'finished', while in Xcode 6, the log states that the suite 'passed'.