Zwe Init Refactor to JCL for v3.x/staging

[MarkAckert]

Test PR so we can compare the changes in this PR against the existing feature/v3/jcl which is based on v2.x/staging.

When these changes look correct, we'll rebase the feature/v3/jcl branch.

[Martin-Zeithaml]

@Martin-Zeithaml do you think this is ready to merge into #3718? After merge, we can change the head on that PR to v3.x/staging

I thought this will be merged (some day) into v3.x/staging and the #3718 will be just deleted.
I am testing this and making changes here only. There are some new problems.

[MarkAckert]

We should close out #3718 then to avoid confusion with this PR. I can update the title and description. cc @1000TurquoisePogs does that sound OK to you?

[MarkAckert]

@Martin-Zeithaml do you think this is ready to merge into #3718? After merge, we can change the head on that PR to v3.x/staging

I thought this will be merged (some day) into v3.x/staging and the #3718 will be just deleted. I am testing this and making changes here only. There are some new problems.

I took a stab at problems 2 and 3, without a complete test suite pointed at it. I added a new message ZWEL0320E which may not help with overloaded or sprawling messages...

[Martin-Zeithaml]

Apfauth

Help:

• zowe.setup.dataset.authLoadlib is the user custom APF LOADLIB. This field is
  optional. If it's not defined, SZWEAUTH from zowe.setup.dataset.prefix data
  set will be APF authorized.
• zowe.setup.dataset.authPluginLib is the user custom APF PLUGINLIB.
  You can install Zowe ZIS plugins into this load library.

zowe.setup.dataset.authLoadlib and zowe.setup.dataset.authPluginLib omitted in config and this is generated by ZWEGEN00:

//STDPARM DD *                                          
SH cd '/zowe/' &&                       
cd bin/utils &&                                         
export LOADLIB='CFG.ZOWE.SETUP.DATASET.AUTHLOADLIB' &&  
export LOADLOC=SMS &&                                   
export PLUGLIB='CFG.ZOWE.SETUP.DATASET.AUTHPLUGINLIB' &&
export PLUGLOC=SMS &&                                   
./opercmd.rex "SETPROG APF,ADD,DSN=$LOADLIB,$LOADLOC" &&
./opercmd.rex "SETPROG APF,ADD,DSN=$PLUGLIB,$PLUGLOC"   
//*                                                     

When trying zwe init apfauth -c ./zowe.yaml:

ERROR: Error ZWEL0157E: zowe.setup.dataset.authLoadlib is not defined in Zowe YAML configuration file.

Expectation:
If zowe.setup.dataset.authLoadlib and zowe.setup.dataset.authPluginLib omitted, the JCL will authorize only zowe.setup.dataset.prefix.SZWEAUTH.

[MarkAckert]

I started on the Apfauth updates, testing in the other PR. More changes to come - the first commit isn't working yet.

[Martin-Zeithaml]

One of my old test is failing. There is no zowe.setup.dataset.prefix defined in the main config, so this line will generate undefined.SZWEAUTH. Then zwe command fails on schema validation:

Validity Exceptions(s) with object at
  Validity Exceptions(s) with object at /zowe
    Validity Exceptions(s) with object at /zowe/setup
      Validity Exceptions(s) with object at /zowe/setup/dataset
        Validity Exceptions(s) with string at /zowe/setup/dataset/authLoadlib
          string pattern match fail s='undefined.SZWEAUTH', pat='^([A-Z\$\#\@]){1}([A-Z0-9\$\#\@\-]){0,7}(\.([A-Z\$\#\@]){1}([A-Z0-9\$\#\@\-]){0,7}){0,11}$', at /zowe/setup/dataset/authLoadlib