## Summary
Relates to: #113217
- Add extra documentation to highlight behaviour of the kibana keystore
(for #113217)
- Fix/Tidy-up commands (`create`, `list`) where the extra unused
arguments were preventing the `options` from being passed to the
functions. Also remove unnecessary `async` keyword from the `remove`
command.
- Added new `show` command
```
Usage: bin/kibana-keystore show [options] <key>
Displays the value of a single setting in the keystore. Pass the -o (or --output) parameter to write the setting to a file.
Options:
-s, --silent prevent all logging
-o, --output <file> output value to a file
-h, --help output usage information
```
### Checklist
Delete any items that are not applicable to this PR.
- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
### For maintainers
- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
---------
Co-authored-by: Kaarina Tungseth <kaarina.tungseth@elastic.co>
Introduces bin/kibana-keystore providing create, list, add, and remove actions.
Settings stored within the keystore will be loaded at runtime.
Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>
