Moving code for cache functions to utils file #201

Job	Run time
Go build for different platforms	8m 7s
Go build for different platforms	8m 7s
Thanos end-to-end tests (8, 0)	13m 27s
Thanos end-to-end tests (8, 0)	5m 22s
Linters (Static Analysis) for Go	3m 1s
Linters (Static Analysis) for Go	3m 1s
Thanos end-to-end tests (8, 1)	3m 55s
Thanos end-to-end tests (8, 1)	3m 55s
Thanos unit tests	17m 52s
Thanos unit tests	17m 52s
Thanos end-to-end tests (8, 2)	4m 7s
Thanos end-to-end tests (8, 2)	4m 7s
Thanos end-to-end tests (8, 3)	4m 47s
Thanos end-to-end tests (8, 3)	4m 47s
Thanos end-to-end tests (8, 4)	7m 37s
Thanos end-to-end tests (8, 4)	7m 37s
Thanos end-to-end tests (8, 5)	5m 0s
Thanos end-to-end tests (8, 5)	5m 0s
Thanos end-to-end tests (8, 6)	4m 46s
Thanos end-to-end tests (8, 6)	4m 46s
Thanos end-to-end tests (8, 7)	4m 41s
Thanos end-to-end tests (8, 7)	4m 41s
	2h 26m 35s

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