implemented ns_config:get_remote with configurable timeout
implemented ns_config:get_remote with configurable timeout

Change-Id: I6c10f2080e513022e27ca25c1f245df92fc921d5
Reviewed-on: http://review.membase.org/3556
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>

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