retry requests in e2e tests #1754

Job	Run time
checkstyle	40s
unit_tests (latest, 7.2, singlesite)	14m 15s
e2e_tests (latest, 7.2)	10m 34s
unit_tests (latest, 7.2, multisite)	13m 58s
e2e_tests (latest, 8.1)	11m 35s
unit_tests (latest, 8.1, singlesite)	13m 34s
e2e_tests (trunk, 7.2)	10m 44s
unit_tests (latest, 8.1, multisite)	13m 49s
e2e_tests (trunk, 8.1)	11m 32s
unit_tests (5.2, 7.2, singlesite)	14m 20s
unit_tests (5.2, 7.2, multisite)	12m 9s
	2h 7m 10s

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