Add a pre-build script to MicroBuild to have the build servers restore the...

Add a pre-build script to MicroBuild to have the build servers restore the NuGet packages before building. (changeset 1351423)

Src/packages/repositories.config

-<?xml version="1.0" encoding="utf-8"?>
-<repositories>
-  <repository path="..\Compilers\Core\CodeAnalysisTest\packages.config" />
-  <repository path="..\Compilers\Core\Desktop\packages.config" />
-  <repository path="..\Compilers\Core\MSBuildTasks\packages.config" />
-  <repository path="..\Compilers\Core\Portable\packages.config" />
-  <repository path="..\Compilers\Core\VBCSCompiler\packages.config" />
-  <repository path="..\Compilers\Core\VBCSCompilerTests\packages.config" />
-  <repository path="..\Compilers\CSharp\csc\packages.config" />
-  <repository path="..\Compilers\CSharp\Desktop\packages.config" />
-  <repository path="..\Compilers\CSharp\Portable\packages.config" />
-  <repository path="..\Compilers\CSharp\Test\CommandLine\packages.config" />
-  <repository path="..\Compilers\CSharp\Test\Emit\packages.config" />
-  <repository path="..\Compilers\CSharp\Test\Semantic\packages.config" />
-  <repository path="..\Compilers\CSharp\Test\Symbol\packages.config" />
-  <repository path="..\Compilers\CSharp\Test\Syntax\packages.config" />
-  <repository path="..\Compilers\Package\packages.config" />
-  <repository path="..\Compilers\PackageFiles\packages.config" />
-  <repository path="..\Compilers\Test\Resources\Core\packages.config" />
-  <repository path="..\Compilers\Test\Utilities\Core2\packages.config" />
-  <repository path="..\Compilers\Test\Utilities\CSharp\packages.config" />
-  <repository path="..\Compilers\Test\Utilities\VisualBasic\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Desktop\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Portable\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Test\CommandLine\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Test\Emit\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Test\Semantic\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Test\Symbol\packages.config" />
-  <repository path="..\Compilers\VisualBasic\Test\Syntax\packages.config" />
-  <repository path="..\Compilers\VisualBasic\vbc\packages.config" />
-  <repository path="..\Diagnostics\FxCop\Core\packages.config" />
-  <repository path="..\Diagnostics\FxCop\CSharp\packages.config" />
-  <repository path="..\Diagnostics\FxCop\Setup\packages.config" />
-  <repository path="..\Diagnostics\FxCop\Test\packages.config" />
-  <repository path="..\Diagnostics\FxCop\VisualBasic\packages.config" />
-  <repository path="..\Diagnostics\Roslyn\Core\packages.config" />
-  <repository path="..\Diagnostics\Roslyn\CSharp\packages.config" />
-  <repository path="..\Diagnostics\Roslyn\Test\packages.config" />
-  <repository path="..\Diagnostics\Roslyn\VisualBasic\packages.config" />
-  <repository path="..\Diagnostics\Test\Utilities\packages.config" />
-  <repository path="..\Test\PdbUtilities\packages.config" />
-  <repository path="..\Test\Utilities\packages.config" />
-  <repository path="..\Tools\Source\CompilerGeneratorTools\Source\BoundTreeGenerator\packages.config" />
-  <repository path="..\Tools\Source\CompilerGeneratorTools\Source\CSharpErrorFactsGenerator\packages.config" />
-  <repository path="..\Tools\Source\CompilerGeneratorTools\Source\CSharpSyntaxGenerator\packages.config" />
-  <repository path="..\Tools\Source\CompilerGeneratorTools\Source\VisualBasicErrorFactsGenerator\packages.config" />
-  <repository path="..\Tools\Source\CompilerGeneratorTools\Source\VisualBasicSyntaxGenerator\packages.config" />
-  <repository path="..\Tools\Source\SyntaxVisualizer\SyntaxVisualizerControl\packages.config" />
-  <repository path="..\Tools\Source\SyntaxVisualizer\SyntaxVisualizerDgmlHelper\packages.config" />
-  <repository path="..\Workspaces\Core\packages.config" />
-  <repository path="..\Workspaces\CoreTest\packages.config" />
-  <repository path="..\Workspaces\CSharp\packages.config" />
-  <repository path="..\Workspaces\CSharpTest\packages.config" />
-  <repository path="..\Workspaces\VisualBasic\packages.config" />
-  <repository path="..\Workspaces\VisualBasicTest\packages.config" />
-</repositories>
\ No newline at end of file