fix uninstall e2e test failure #1697

Job	Run time
checkstyle	25s
unit_tests (latest, 7.2, singlesite)	13m 27s
e2e_tests (latest, 7.2)	15m 26s
unit_tests (latest, 7.2, multisite)	11m 53s
unit_tests (latest, 8.1, singlesite)	14m 39s
e2e_tests (latest, 8.1)	16m 10s
unit_tests (latest, 8.1, multisite)	14m 53s
e2e_tests (trunk, 7.2)	15m 46s
unit_tests (5.2, 7.2, singlesite)	12m 37s
e2e_tests (trunk, 8.1)	16m 39s
unit_tests (5.2, 7.2, multisite)	15m 6s
	2h 27m 1s

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