e2e: add test for cpnp replication #20

Job	Run time
Go build with -tags=stringlabels	38s
Go build for different platforms	9m 42s
Thanos end-to-end tests (8, 0)	5m 7s
Check misspelled words	10s
Thanos end-to-end tests (8, 1)	3m 54s
Linters (Static Analysis) for Go	2m 57s
Thanos end-to-end tests (8, 2)	3m 46s
Thanos end-to-end tests (8, 3)	4m 34s
Thanos end-to-end tests (8, 4)	8m 12s
Thanos end-to-end tests (8, 5)	4m 13s
Thanos end-to-end tests (8, 6)	4m 30s
Thanos end-to-end tests (8, 7)	4m 23s
	52m 6s

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