Introduce integration tests using real MySQL and PostgreSQL #4

Job	Run time
integration_test (mysql2, ar_6.1)	35s
integration_test (mysql2, ar_6.1)	1s
integration_test (mysql2, ar_6.1)	1s
integration_test (mysql2, ar_6.1)	1s
integration_test (mysql2, ar_6.1)	1s
integration_test (mysql2, ar_6.1)	29s
integration_test (mysql2, ar_7.0)	27s
integration_test (mysql2, ar_7.0)	27s
integration_test (mysql2, ar_7.0)	27s
integration_test (mysql2, ar_7.0)	27s
integration_test (mysql2, ar_7.0)	27s
integration_test (mysql2, ar_7.0)	30s
integration_test (mysql2, ar_7.1)	34s
integration_test (mysql2, ar_7.1)	34s
integration_test (mysql2, ar_7.1)	34s
integration_test (mysql2, ar_7.1)	1s
integration_test (mysql2, ar_7.1)	1s
integration_test (mysql2, ar_7.1)	32s
integration_test (postgresql, ar_6.1)	32s
integration_test (postgresql, ar_6.1)	32s
integration_test (postgresql, ar_6.1)	31s
integration_test (postgresql, ar_6.1)	31s
integration_test (postgresql, ar_6.1)	31s
integration_test (postgresql, ar_6.1)	33s
integration_test (postgresql, ar_7.0)	28s
integration_test (postgresql, ar_7.0)	28s
integration_test (postgresql, ar_7.0)	28s
integration_test (postgresql, ar_7.0)	28s
integration_test (postgresql, ar_7.0)	28s
integration_test (postgresql, ar_7.0)	33s
integration_test (postgresql, ar_7.1)	28s
integration_test (postgresql, ar_7.1)	28s
integration_test (postgresql, ar_7.1)	28s
integration_test (postgresql, ar_7.1)	28s
integration_test (postgresql, ar_7.1)	28s
integration_test (postgresql, ar_7.1)	29s
	15m 1s

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