Add random host provider for zk #537

Job	Run time
Build images	5s
test (GODOG_FEATURE=active_nodes.feature make test)	7m 5s
test (GODOG_FEATURE=async.feature make test)	3m 21s
test (GODOG_FEATURE=cascade_replicas.feature make test)	6m 53s
test (GODOG_FEATURE=CLI.feature make test)	3m 55s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 35s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 2s
test (GODOG_FEATURE=failover.feature make test)	12m 8s
test (GODOG_FEATURE=free_space.feature make test)	5m 50s
test (GODOG_FEATURE=host_discovery.feature make test)	2m 58s
test (GODOG_FEATURE=host_management.feature make test)	3m 1s
test (GODOG_FEATURE=maintenance.feature make test)	4m 24s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 11s
test (GODOG_FEATURE=priority.feature make test)	5m 33s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	1m 59s
test (GODOG_FEATURE=recovery.feature make test)	3m 7s
test (GODOG_FEATURE=repair.feature make test)	9m 44s
test (GODOG_FEATURE=repl_mon.feature make test)	3m 31s
test (GODOG_FEATURE=statefile.feature make test)	3m 48s
test (GODOG_FEATURE=switchover_from.feature make test)	10m 24s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 33s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 27s
test (GODOG_FEATURE=zk_maintenance.feature make test)	3m 57s
	1h 58m 31s

Provide feedback