Major Description
If the environment already contains any/some/all of OOZIE_CONFIG, OOZIE_LOG, and OOZIE_DATA then the scripts that rely on oozie-sys.sh to set these and other variables will keep those previously set values. ooziedb.sh doesn't source oozie-sys.sh and instead hardcodes those three env vars so they are always overwritten; we should allow them to be set beforehand like the other scripts.