Added a new test_env.txt file to capture common shell variable. Added concept of COMPILEJAVA for use when TESTJAVA is a JRE. If COMPILEJAVA not set then TESTJAVA will be the default with assumption it is a JDK. Reviewed-by: kvn, brutisso, coleenp
Add case for CYGWIN in .sh files. Reviewed-by: coleenp, kvn
Add Darwin like Linux to shell scripts Reviewed-by: kvn, kamg, dholmes
Disabling default config files if -XX:-ReadDefaultConfigFiles Reviewed-by: phh, jrose, dcubed, dholmes
