bug 2686 - fix error catch of port_close
bug 2686 - fix error catch of port_close

Change-Id: I2be42b96d805c4ab9858153fc076a62c186fce4b
Reviewed-on: http://review.northscale.com/3083
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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