Add 17beta2 images #294

Job	Run time
push-test-images-for-dev (citusupgradetester)	3m 48s
push-test-images-for-release	0s
prepare_pgversion_matrix	3s
push-test-images-for-dev (pgupgradetester)	2m 34s
push-test-images-for-dev (stylechecker)	2m 16s
push-test-images-for-dev (extbuilder, 14.12)	1m 20s
push-test-images-for-dev (extbuilder, 15.7)	1m 26s
push-test-images-for-dev (extbuilder, 16.3)	1m 51s
push-test-images-for-dev (extbuilder, 17~beta2)	1m 53s
push-test-images-for-dev (exttester, 14.12)	3m 13s
push-test-images-for-dev (exttester, 15.7)	3m 43s
push-test-images-for-dev (exttester, 16.3)	3m 56s
push-test-images-for-dev (exttester, 17~beta2)	41s
push-test-images-for-dev (failtester, 14.12)	2m 21s
push-test-images-for-dev (failtester, 15.7)	1m 54s
push-test-images-for-dev (failtester, 16.3)	2m 26s
push-test-images-for-dev (failtester, 17~beta2)	2m 33s
	35m 58s

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