simplification in config server #3573

Job	Run time
build	3m 13s
test_when_cache_missing	0s
test_when_cache_present (0, 9, 678)	32m 36s
test_when_cache_present (1, 9, 678)	32m 40s
test_when_cache_present (2, 9, 678)	28m 59s
test_when_cache_present (3, 9, 678)	28m 48s
test_when_cache_present (4, 9, 678)	26m 48s
test_when_cache_present (5, 9, 678)	28m 12s
test_when_cache_present (6, 9, 678)	27m 55s
test_when_cache_present (7, 9, 678)	32m 59s
test_when_cache_present (8, 9, 678)	29m 21s
test_when_cache_present (9, 9, 678)	17m 25s
save_test_times_when_cache_missing	0s
save_test_times_when_cache_present	7s
	4h 49m 3s

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