Prior to this PR, the pipeline was not running all tests under the advertised 
JVM.  Now:

* pipeline explicitly sets compileJavac and testJVM
* pipeline no longer sets JAVA_HOME when invoking gradlew
  * this ensures unintended java version does not leak into tests
* developers may set JAVA_HOME and it will be used as default for both

This fix exposes additional Java 11 test failures now that all tests are 
running with intended version of Java.

This PR also subsumes https://github.com/apache/geode/pull/2608

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