Added test for clientFoundRows.
Added test for clientFoundRows.

VividCortex/mysql,go-sql-driver/mysql,helight/helight_code,henrylee2cn/mysql,cxflag203/mysql,jockchou/mysql,Freeaqingme/golang-sql-driver-mysql,nanata1115/mysql,helight/helight_code,zhgo/mysql,segmentio/mysql,sunjian1/mysql,rlowe/mysql,bookerzzz/mysql,yyljlyy/mysql,LightKool/mysql-go,siriele/mysql,Frca/mysql,roth1002/mysql,hebihui/mysql,VividCortex/mysql,hyperworks/mysql,methane/mysql,helight/helight_code,muthusubbu459/mysql,chinanjjohn2012/mysql,helight/helight_code,helight/helight_code,netroby/mysql,yonglehou/mysql,springning/mysql,segmentio/mysql,helight/helight_code,helight/helight_code,dalinaum/go-mysql-driver,methane/mysql,rafaeljusto/mysql,LightKool/mysql-go,Vorstack/mysql,aperera/mysql,wfxiang08/mysql,helight/helight_code,tmulchay/mysql,helight/helight_code,bookerzzz/mysql,eXcomm/gomysql,joshuaprunier/mysql,cw2018/mysql,Go-SQL-Driver/MySQL,eklitzke/mysql,beego/mysql