Fix NugetRestore.ps1 to not look for packages.config
Fix NugetRestore.ps1 to not look for packages.config

Fixes #946

pakdev/roslyn-analyzers,jasonmalinowski/roslyn-analyzers,dotnet/roslyn-analyzers,natidea/roslyn-analyzers,mavasani/roslyn-analyzers,pakdev/roslyn-analyzers,qinxgit/roslyn-analyzers,genlu/roslyn-analyzers,dotnet/roslyn-analyzers,heejaechang/roslyn-analyzers,mavasani/roslyn-analyzers,bkoelman/roslyn-analyzers