fix uninstall e2e test failure #1699

Job	Run time
checkstyle	36s
e2e_tests (latest, 7.2)	15m 36s
unit_tests (latest, 7.2, singlesite)	13m 9s
e2e_tests (latest, 8.1)	16m 15s
e2e_tests (trunk, 7.2)	15m 50s
unit_tests (latest, 7.2, multisite)	13m 6s
e2e_tests (trunk, 8.1)	17m 45s
unit_tests (latest, 8.1, singlesite)	14m 44s
unit_tests (latest, 8.1, multisite)	15m 4s
unit_tests (5.2, 7.2, singlesite)	12m 19s
unit_tests (5.2, 7.2, multisite)	14m 25s
	2h 28m 49s

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