Linq2db: Reenable 2 Ormbattle Tests on OSX

[jogibear9988]

When https://github.com/dotnet/corefx/issues/9649 is fixed, we should reenable "SelectSubqueryTest" & "ComplexTest1" so we see the stacktrace and can fix them.

[jogibear9988]

@ili is it ok, that I convert the netcore packages to the new csproj format? (While working on this ticket)

[ili]

@jogibear9988 sorry for late response.
You can convert them. Also appveyor reconfiguration would be needed, because now we do use VS2015, and we'll use it in future while we do need to support silverlight, so we'll need to have two build configurations... or may me image can be switched with matrix...

https://www.appveyor.com/docs/build-environment/#silverlight

[ili]

Guys from AV are very friendly :) They have added SL SDK adter my request :)

[MaceWindu]

@GonzoSpire can you remove Ignore attributes from OrmBattleTests tests and set ActiveIssue if some of them still fail?

[MaceWindu]

not actionable