Log full exception string during ToolTask exceptions (#3576)
Log full exception string during ToolTask exceptions (#3576)

Fixes #911
AndyGerlicher/msbuild,cdmihai/msbuild,chipitsine/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,jeffkl/msbuild,chipitsine/msbuild,sean-gilliam/msbuild,jeffkl/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,mono/msbuild,rainersigwald/msbuild,cdmihai/msbuild,mono/msbuild,Microsoft/msbuild,sean-gilliam/msbuild,chipitsine/msbuild,chipitsine/msbuild,cdmihai/msbuild,mono/msbuild,rainersigwald/msbuild,jeffkl/msbuild,mono/msbuild,Microsoft/msbuild,sean-gilliam/msbuild,jeffkl/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,AndyGerlicher/msbuild,Microsoft/msbuild,Microsoft/msbuild