Many skipped tests have skip reasons referring to obsolete bug tracking systems

[gafter]

Many compiler tests are skipped with skip reasons referring to just a number, which is apparently a reference to some obsolete bug tracking system. We should have an issue in github for every skipped test.

Here is a small sampling:

R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\Source\PropertyTests.cs(1177):        [Fact(Skip = "527664")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\Source\PropertyTests.cs(1200):        [Fact(Skip = "527657")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\Source\PropertyTests.cs(1239):        [Fact(Skip = "527660")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\Source\PropertyTests.cs(1300):        [Fact(Skip = "527656")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\ExtensionMethodTests.cs(754):        [Fact(Skip = "528425")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\ExtensionMethodTests.cs(1211):        [Fact(Skip = "528425")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\ExtensionMethodTests.cs(2940):        [Fact(Skip = "529596")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\IndexedPropertyTests.cs(2523):        [Fact(Skip = "530571")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\IndexerTests.cs(1430):        [Fact(Skip = "528830")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\InterfaceImplementationTests.cs(1423):        [Fact(Skip = "528858")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\InterfaceImplementationTests.cs(1442):        [Fact(Skip = "528901")]
  R:\Roslyn\src\Compilers\CSharp\Test\Symbol\Symbols\InterfaceImplementationTests.cs(1806):        [Fact(Skip = "528913")]