Soft-delete all per-node keys from config when shunning a node.
Soft-delete all per-node keys from config when shunning a node.

Change-Id: I358ed41f413810371e77cb40730174afe3998b20
Reviewed-on: http://review.couchbase.org/35288
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

membase/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,membase/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,daverigby/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,daverigby/ns_server,mschoch/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,membase/ns_server,mschoch/ns_server,ceejatec/ns_server,membase/ns_server,nimishzynga/ns_server,mschoch/ns_server,nimishzynga/ns_server,ceejatec/ns_server,mschoch/ns_server,ceejatec/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,membase/ns_server,nimishzynga/ns_server