select all peers in one scheduler_cluster #900

Job	Run time
e2e_tests (normal)	37m 36s
e2e_tests (concurent-back-source)	40m 27s
e2e_tests (grpc-tls)	41m 19s
e2e_tests (disable-seed-peer)	24m 36s
e2e_tests (grpc-tls-ipv6)	38m 10s
e2e_tests (ipv6)	38m 44s
e2e_tests (split-running-tasks)	39m 41s
e2e_tests (cache-list-metadata)	38m 56s
e2e_tests (write-buffer-size)	37m 55s
	5h 37m 24s

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