RFR: 8277348: Use String.stripTrailing() in jdk.jshell where applicable [v2]

[Andrey Turbanov]

> There are 2 methods in jdk.jshell module which trim trailing whitespace characters from String.
> 1. jdk.internal.jshell.tool.JShellTool#trimEnd
> 2. jdk.jshell.Util#trimEnd
> 
> Since Java 11 we have a method String.stripTrailing which could be used instead.

Andrey Turbanov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - 8277348: Use String.stripTrailing() in jdk.jshell where applicable
   
   update copyright year
 - Merge remote-tracking branch 'origin/master' into use_String.stripTrailing_in_jdk.jshell
   
   # Conflicts:
   #	src/jdk.jshell/share/classes/jdk/jshell/SourceCodeAnalysisImpl.java
 - [PATCH] Use String.stripTrailing() in jdk.jshell where applicable

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Changes: https://git.openjdk.org/jdk/pull/6365/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=6365&range=01
  Stats: 43 lines in 4 files changed: 0 ins; 33 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/6365.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/6365/head:pull/6365

PR: https://git.openjdk.org/jdk/pull/6365