send ns_log sync back if merged logs differ
send ns_log sync back if merged logs differ

Change-Id: Ida0c45843a4e86505b42c6c0c72c746c4925d564
Reviewed-on: http://review.membase.org/6143
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Dale Harvey <491ccac09a36ad1e38b698f273b84fd8efc31071@arandomurl.com>
Reviewed-by: Dale Harvey <491ccac09a36ad1e38b698f273b84fd8efc31071@arandomurl.com>

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