tests/e2e: fix dex tests failing (#11761) #135

Job	Run time
lint-golint	1m 12s
test-unittest	3m 15s
ci-outpost-mark	1s
build-container (proxy)	2m 45s
build-binary (proxy, linux, amd64)	1m 47s
build-container (ldap)	2m 16s
build-binary (proxy, linux, arm64)	2m 3s
build-container (radius)	2m 18s
build-binary (ldap, linux, amd64)	1m 58s
build-container (rac)	2m 8s
build-binary (ldap, linux, arm64)	1m 44s
build-binary (radius, linux, amd64)	1m 39s
build-binary (radius, linux, arm64)	1m 48s
build-binary (rac, linux, amd64)	1m 42s
build-binary (rac, linux, arm64)	1m 48s
	28m 24s

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