Fix map if only one node is active and it's not the master.
Fix map if only one node is active and it's not the master.

This takes care of the case where the orchestrator dies between doing
a move and updating the map, or if the update of the map somehow
fails.

Change-Id: I84bf309fb12bb70969e86e36124e9b238935ab5a
Reviewed-on: http://review.northscale.com:8080/807
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

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