[jdk11u-dev] RFR: 8245147: Refactor and improve utility of test/langtools/tools/javac/versions/Versions.java

[Goetz Lindenmaier]

I backport this for parity with 11.0.14-oracle.

I had to resolve some chunks due to context differences.
Other places did not apply because there are only
test cases up to 10 in the current test.
I added the test cases New11 and New14, they seem 
to make sense for 11 now.
I had to undo the text blocks.

Unfortunately "8211148: var in implicit lambdas shouldn't be accepted
for source < 11" is not in 11, so New11 can be compiled with 
-source 10.  I commented out that test case. 
Test is passing this way.

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Commit messages:
 - Backport 6cbf57aa377c3e6edf79f31927e5cea69ef90a1d

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/486/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=486&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8245147
  Stats: 153 lines in 1 file changed: 50 ins; 37 del; 66 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/486.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/486/head:pull/486

PR: https://git.openjdk.java.net/jdk11u-dev/pull/486