catch handshake errors
catch handshake errors

Fixes issue #36

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