refact pkg/apiserver (auth helpers) #3917

Job	Run time
postgres / Functional tests	12m 50s
postgres / Functional tests	12m 50s
mysql / Functional tests	13m 52s
mysql / Functional tests	13m 39s
hub / Functional tests (hub-1.bats)	9m 48s
hub / Functional tests (hub-1.bats)	9m 48s
mariadb / Functional tests	13m 17s
mariadb / Functional tests	13m 17s
hub / Functional tests (hub-2.bats)	11m 34s
hub / Functional tests (hub-2.bats)	11m 34s
hub / Functional tests (hub-3.bats)	9m 43s
hub / Functional tests (hub-3.bats)	9m 43s
sqlite / Functional tests	12m 23s
sqlite / Functional tests	12m 23s
	2h 46m 41s

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