Better logging for AssertLogContains in Utilities (#2115)
Better logging for AssertLogContains in Utilities (#2115)

The old way was confusing to diagnose because it didn't emit the log,
and also (horror of horrors) did a bunch of string concatenation.
mono/msbuild,jeffkl/msbuild,AndyGerlicher/msbuild,jeffkl/msbuild,chipitsine/msbuild,mono/msbuild,mono/msbuild,Microsoft/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,jeffkl/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,chipitsine/msbuild,Microsoft/msbuild,rainersigwald/msbuild,chipitsine/msbuild,chipitsine/msbuild,Microsoft/msbuild,rainersigwald/msbuild,mono/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,jeffkl/msbuild,cdmihai/msbuild,Microsoft/msbuild,cdmihai/msbuild