Annotations: Allow ciphers with underscores.

[steve21168]

The ingress annotation nginx.ingress.kubernetes.io/ssl-ciphers is disallowing valid ciphers that have an underscore.

The nginx documentation - states about valid ciphers:

The full list can be viewed using the “openssl ciphers” command.

From the latest official image: registry.k8s.io/ingress-nginx/controller:v1.12.1@sha256:d2fbc4ec70d8aa2050dd91a91506e998765e86c96f32cffb56c503c9c34eed5b

$ openssl ciphers
TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:....

What this PR does / why we need it:

It allows for valid SSL ciphers with underscores.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

Yes via the validation unit test

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

If this is considered to be accepted I can go fill out the CLAs.

[linux-foundation-easycla]

• ✅login: steve21168 / (5a05b28)

The committers listed above are authorized under a signed CLA.

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[Gacko]

/retitle Annotations: Allow ciphers with underscores.
/triage accepted
/kind bug
/priority backlog
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gacko, steve21168

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[Gacko]

/cherry-pick release-1.12

[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.12 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.12

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[Gacko]

/cherry-pick release-1.11

[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.11 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.11

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[Gacko]

@steve21168: You need to sign the CLA to get this PR merged.

[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13140

In response to this:

/cherry-pick release-1.12

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13141

In response to this:

/cherry-pick release-1.11

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