Upgrade MySql client and remove allowed failures on CI builds

Author: bahusoid

.travis.yml

@@ -13,9 +13,6 @@ env:
   - DB=Firebird 
   - DB=MySQL CONNECTION_STRING="Server=127.0.0.1;Uid=root;Database=nhibernate;Old Guids=True;"   
   - DB=SQLite 
-matrix:
-  allow_failures:
-    - env: DB=MySQL CONNECTION_STRING="Server=127.0.0.1;Uid=root;Database=nhibernate;Old Guids=True;"
 before_install:
   - curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
   - curl https://packages.microsoft.com/config/ubuntu/14.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list

appveyor.yml

@@ -13,9 +13,6 @@ environment:
 init:
     # Required for having windows endlines in sources zip
     - git config --global core.autocrlf true
-matrix:
-  allow_failures:
-  - DB: MySQL
 build: off
 before_test:
 - ps: |-

src/NHibernate.Test/NHibernate.Test.csproj

@@ -65,6 +65,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.1" />
     <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="6.3.0" />
     <PackageReference Include="Npgsql" Version="4.0.3" />
+    <PackageReference Include="MySql.Data" Version="8.0.21" />
   </ItemGroup>
   <ItemGroup Condition="$(NhNetFx)">
     <Reference Include="System.Configuration" />
@@ -74,7 +75,6 @@
     <Reference Include="System.Data.OracleClient" />
     <PackageReference Include="Microsoft.SqlServer.Compact" Version="4.0.8876.1" />
     <PackageReference Include="Oracle.ManagedDataAccess" Version="12.1.2400" />
-    <PackageReference Include="MySql.Data" Version="6.9.11" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)'=='netcoreapp2.0'">
     <PackageReference Include="System.CodeDom" Version="4.4.0" />
@@ -83,7 +83,6 @@
     <PackageReference Include="System.Data.Odbc" Version="4.5.0" />
     <PackageReference Include="System.Net.NameResolution" Version="4.3.0" />
     <PackageReference Include="NUnitLite" Version="3.12.0" />
-    <PackageReference Include="MySql.Data" Version="6.10.6" />
   </ItemGroup>
   <ItemGroup Condition=" '$(NuGetPackageRoot)' != '' ">
     <NativeBinaries Include="$(NuGetPackageRoot)microsoft.sqlserver.compact\4.0.8876.1\NativeBinaries\**\*.*" />