simplified stat info collections code
simplified stat info collections code

Change-Id: Ic34bd000db93c3147e5303bf95c26beaf2132ae1
Reviewed-on: http://review.membase.org/4906
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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