Stack 9 support #2825

Job	Run time
Build	28s
Lint	1m 45s
Matrix Acceptance Test (7.17.13)	4m 32s
Matrix Acceptance Test (8.0.1)	5m 7s
Matrix Acceptance Test (8.1.3)	4m 50s
Matrix Acceptance Test (8.2.3)	4m 40s
Matrix Acceptance Test (8.3.3)	4m 51s
Matrix Acceptance Test (8.4.3)	4m 45s
Matrix Acceptance Test (8.5.3)	4m 44s
Matrix Acceptance Test (8.6.2)	4m 45s
Matrix Acceptance Test (8.7.1)	4m 50s
Matrix Acceptance Test (8.8.2)	4m 57s
Matrix Acceptance Test (8.9.2)	5m 23s
Matrix Acceptance Test (8.10.3)	6m 1s
Matrix Acceptance Test (8.11.4)	5m 59s
Matrix Acceptance Test (8.12.2)	6m 17s
Matrix Acceptance Test (8.13.4)	6m 15s
Matrix Acceptance Test (8.14.3)	6m 33s
Matrix Acceptance Test (8.15.5)	6m 50s
Matrix Acceptance Test (8.16.2)	6m 55s
Matrix Acceptance Test (8.17.0)	6m 46s
Matrix Acceptance Test (9.0.0-SNAPSHOT)	6m 29s
	1h 53m 42s

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