allow independent cluster_runs in parallel
allow independent cluster_runs in parallel

Change-Id: Ibe37bff5c0333ab3263f5991477469a4a1c946b5
Reviewed-on: http://review.membase.org/5321
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

vzasade/ns_server,membase/ns_server,mschoch/ns_server,daverigby/ns_server,membase/ns_server,mschoch/ns_server,nimishzynga/ns_server,ceejatec/ns_server,ceejatec/ns_server,nimishzynga/ns_server,vzasade/ns_server,nimishzynga/ns_server,membase/ns_server,membase/ns_server,pavel-blagodov/ns_server,membase/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,ceejatec/ns_server,vzasade/ns_server,nimishzynga/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,vzasade/ns_server,ceejatec/ns_server,ceejatec/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,membase/ns_server,daverigby/ns_server,daverigby/ns_server