Path.Combine in DistributedFileLoggerParameters
Path.Combine in DistributedFileLoggerParameters

This was failing on the OS X CI because of a "Directory not empty"
exception when cleaning up the test--because files were getting
created with embedded backslashes, instead of directory separators.

cdmihai/msbuild,jeffkl/msbuild,chipitsine/msbuild,Microsoft/msbuild,jeffkl/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,cdmihai/msbuild,mono/msbuild,mono/msbuild,chipitsine/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,Microsoft/msbuild,jeffkl/msbuild,AndyGerlicher/msbuild,Microsoft/msbuild,cdmihai/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,mono/msbuild,AndyGerlicher/msbuild,jeffkl/msbuild,chipitsine/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,chipitsine/msbuild,Microsoft/msbuild,mono/msbuild,rainersigwald/msbuild