fix uninstall e2e test failure #1693

Job	Run time
checkstyle	31s
e2e_tests (latest, 7.2)	15m 35s
unit_tests (latest, 7.2, singlesite)	15m 15s
e2e_tests (latest, 8.1)	16m 10s
e2e_tests (trunk, 7.2)	16m 0s
unit_tests (latest, 7.2, multisite)	13m 24s
e2e_tests (trunk, 8.1)	16m 23s
unit_tests (latest, 8.1, singlesite)	16m 55s
unit_tests (latest, 8.1, multisite)	16m 25s
unit_tests (5.2, 7.2, singlesite)	12m 56s
unit_tests (5.2, 7.2, multisite)	12m 47s
	2h 32m 21s

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