[graylog] Update chart to support Graylog 3

[KongZ]

What this PR does / why we need it:

• Upgrade default Graylog image to version 3.0.1
• Add new graylog.journal.deleteBeforeStart option for delete Journal files before start. This will help to resolve the problem when Graylog journal files corrupted.
• Update some error in documentation on README and NOTES.txt
• Move startup script to configmap. This will make Pod looks clean

This Chart is backward compatibility with Graylog. 2.x

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md

[k8s-ci-robot]

Hi @KongZ. Thanks for your PR.

I'm waiting for a helm member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[KongZ]

/ok-to-test

[k8s-ci-robot]

@KongZ: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/ok-to-test

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[KongZ]

/lgtm

[k8s-ci-robot]

@KongZ: you cannot LGTM your own PR.

In response to this:

/lgtm

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[KongZ]

/assign maver1ck

[KongZ]

/assign cpanato

[cpanato]

/ok-to-test

[cpanato]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, KongZ

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• stable/graylog/OWNERS [KongZ,cpanato]

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