Merge pull request dotnet/coreclr#3329 from joperezr/CleanToolRuntime
authorJose Perez Rodriguez <joperezr@microsoft.com>
Fri, 26 Feb 2016 18:36:08 +0000 (10:36 -0800)
committerJose Perez Rodriguez <joperezr@microsoft.com>
Fri, 26 Feb 2016 18:36:08 +0000 (10:36 -0800)
Correctly cleaning up the ToolRuntime folder once a new version is required

Commit migrated from https://github.com/dotnet/coreclr/commit/492d298077b6220c29d3f80c4006ca1820d4efbc


Trivial merge