Bug 1517: don't try to talk to down nodes in the janitor
Bug 1517: don't try to talk to down nodes in the janitor

Web requests were failing because menelaus_web was timing out trying
to talk to ns_orchestrator, which was waiting on trying to talk to
memcached on the down node.

Change-Id: I14a594c01d3d41076f78424413fef6a12323730d
Reviewed-on: http://review.northscale.com:8080/823
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

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