Don't allow setting a map with duplicate nodes
Don't allow setting a map with duplicate nodes

Change-Id: I437a986d32f575d3e45630ec2c7ddf7827b0eb88
Reviewed-on: http://review.northscale.com/2621
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

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