`init apf` support authLoadlib only with a reasonable default

[MarkAckert]

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.

Originally posted by @Martin-Zeithaml in #4107 (comment)

[MarkAckert]

will be addressed in #4107

[Martin-Zeithaml]

init mvs

• Create parmlib, authLoadlib, authPluginLib - all optional
  • Copy ZWESIP00 to parmlib
  • Create & copy load modules to authLoadlib, if authLoadlib is not equal to zowe.setup.dataset.prefix.SZWEAUTH

Maximal Init MVS Scenario

All datasets are created and all members were copied.

Minimal Init MVS Scenario

If authLoadlib is different from zowe.setup.dataset.prefix.SZWEAUTH, create and copy load modules.
If all parmlib, authLoadlib, authPluginLib not set, do nothing and ends with success.

Additional checks?

If components.zss.enabled and parmlib undefined, error.

init apfauth

• authPluginLib should be optional
• If zss & zis not used, only ZWELNCH would be used, APF not needed at all