Migrate appveyor build to MySql 8#3450

fredericDelaporte wants to merge 5 commits intonhibernate:5.3.xnhibernate/nhibernate-core:5.3.xfrom

fredericDelaporte:appveyor-mySql-5.3.xfredericDelaporte/nhibernate-core:appveyor-mySql-5.3.xCopy head branch name to clipboard