smarter waiting for the database #1679

Job	Run time
checkstyle	24s
e2e_tests (latest, 7.2)	6m 11s
unit_tests (latest, 7.2, singlesite)	8m 46s
e2e_tests (latest, 8.1)	5m 58s
unit_tests (latest, 7.2, multisite)	8m 44s
e2e_tests (trunk, 7.2)	5m 59s
unit_tests (latest, 8.1, singlesite)	8m 35s
e2e_tests (trunk, 8.1)	6m 10s
unit_tests (latest, 8.1, multisite)	8m 39s
unit_tests (5.2, 7.2, singlesite)	8m 46s
unit_tests (5.2, 7.2, multisite)	8m 44s
	1h 16m 56s

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