Cherrypick es keystore entries

[Bernhard-Fluehmann]

Add support to add,update and delete elasticsearch.keystore entries.

Obsoletes #685 Fix #684

@bndabbs Please have a look

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[Bernhard-Fluehmann]

@jmlrt Could you add the feature label and assignement as from #685 to this PR? thanks

[schallee]

Would it be better to use something like:

`- command: stdin: "{{passphrase}}" argv:

• "{{keystore_cmd}}"
• add
• '-x'
• '-f'
• "xpack.security.{{ item }}.secure_password" `

instead of echo pipe? I worry that certain values (eg: randomly generated password) could contain shell meta characters which would cause problems.

[Bernhard-Fluehmann]

@schallee Thank yor for bringing this up. I have refactored it already and updated the pull request.

[bndabbs]

Thanks for the contribution @BernardIsibor. I'm hoping to review this PR either today or tomorrow.

[bndabbs]

jenkins test this please

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[jmlrt]

cla/check