remove badarith diagnostics code in menelaus_stats
remove badarith diagnostics code in menelaus_stats

Change-Id: Id281ac03860116b244e5e151ea0d4f71ae98d602
Reviewed-on: http://review.couchbase.org/6889
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>

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