Enforce java provided by IBM

[jonnyz32]

Update docs, to ensure user uses the correct java version.
Exit program if java version is not from IBM.
closes #178

-bash-5.2$ java -jar manzan-1.0-jar-with-dependencies.jar --configdir=/Qopensys/etc/manzanjz
Java vendor: Eclipse OpenJ9
Error: This application requires Java provided by IBM
-bash-5.2$ export JAVA_HOME=/QOpenSys/QIBM/ProdData/JavaVM/jdk11/64bit
-bash-5.2$ java -jar manzan-1.0-jar-with-dependencies.jar --configdir=/Qopensys/etc/manzanjz
WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
Apache Camel version 3.14.8
target URI: stream://file?fileName=/tmp/mzntestoutput
STRWCH Command:
QSYS/STRWCH SSNID(jonathankk)  WCHPGM(MANZAN/HANDLER) WCHMSG((*ALL)) WCHMSGQ(JONATHAN/MANZANQ)
Watch jonathankk started successfully

[SanjulaGanepola]

Can we try using null instead of *CURRENT as mentioned here: IBM/JTOpen#49

[SanjulaGanepola]

Can we try using null instead of *CURRENT as mentioned here: IBM/JTOpen#49

@ThePrez Any comment on this change? I found the original issue you opened on passing *CURRENT as the password when using OpenJDK. Seems like passing in null is not yet supported so using IBM java is a requirement for now?