Changed output of .class files generated during the test 'do all files in test/idempotency compile with javac' to a temp dir to avoid cluttering the test dir with a giant stack of class files.
Changed output of .class files generated during the test 'do all files in test/idempotency compile with javac' to a temp dir to avoid cluttering the test dir with a giant stack of class files.

rzwitserloot/lombok.ast,komalsukhani/deb-lombok.ast,evant/android-retrolambda-lombok,komalsukhani/deb-lombok.ast,evant/android-retrolambda-lombok,rzwitserloot/lombok.ast,evant/android-retrolambda-lombok,rzwitserloot/lombok.ast,komalsukhani/deb-lombok.ast