Get External Security Manager name

[Martin-Zeithaml]

Proposed changes

Executable returning the External Security Manager name.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

PR Checklist

Please delete options that are not relevant.

• If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• My code follows the style guidelines of this project (see: Contributing guideline)
• Relevant update to CHANGELOG.md
• My changes generate no new warnings

Testing

Development system
./getesm
TSS

Minisystem 1
$ ./getesm
RACF
$

Minisystem 2
# ./getesm
ACF2
#

[1000TurquoisePogs]

This looks good to me. How about next steps?

1. isn't auto-built yet but easy to do
2. are we taking the build and putting it into zowe/bin/utils?

[Martin-Zeithaml]

Thanks for review.
Suggested steps are logical, however I am not exactly sure about the changes to make it happen.

[1000TurquoisePogs]

Tested and automated.