Enable docker stop #98

Job	Run time
Collect tests	3s
Test (phpunit_test)	7m 27s
Test (phpunit_bisect_test)	9m 21s
Code coverage (phpunit_test)	7m 27s
Test (behat_test)	7m 43s
Code coverage (phpunit_bisect_test)	9m 21s
Test (behat_bisect_test)	7m 10s
Code coverage (behat_test)	7m 52s
Test (runner_test)	1m 42s
Code coverage (behat_bisect_test)	6m 59s
Test (postjobs_test)	12m 49s
Code coverage (runner_test)	1m 51s
Code coverage (postjobs_test)	13m 17s
	1h 33m 2s

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