hg: amber/amber: redoing the error message simplification, going for a simpler less intrusive version

[vicente.romero at oracle.com]

Changeset: 284161a6a8f8
Author:    vromero
Date:      2018-09-12 09:32 -0700
URL:       http://hg.openjdk.java.net/amber/amber/rev/284161a6a8f8

redoing the error message simplification, going for a simpler less intrusive version

! src/jdk.compiler/share/classes/com/sun/tools/javac/util/RichDiagnosticFormatter.java
! test/langtools/jdk/jshell/TypeNameTest.java
! test/langtools/tools/javac/T8187978/FilterOutCandidatesForDiagnosticsTest.out
! test/langtools/tools/javac/generics/inference/EagerReturnTypeResolution/EagerReturnTypeResolutionTestb.out
! test/langtools/tools/javac/varargs/6806876/T6806876.out