cherry pick upstream fix to memorize tsdb client #446

Job	Run time
Check misspelled words	10s
Go build for different platforms	8m 56s
Go build with -tags=stringlabels	2m 7s
Linters (Static Analysis) for Go	3m 46s
Thanos unit tests	12m 26s
Thanos end-to-end tests (8, 0)	5m 53s
Thanos end-to-end tests (8, 1)	4m 47s
Thanos end-to-end tests (8, 2)	4m 37s
Thanos end-to-end tests (8, 3)	5m 9s
Thanos end-to-end tests (8, 4)	8m 23s
Thanos end-to-end tests (8, 5)	4m 57s
Thanos end-to-end tests (8, 6)	5m 16s
Thanos end-to-end tests (8, 7)	4m 52s
	1h 11m 19s

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