Drop all capabilities for the webhook server container

[qbarrand]

This fixes the following issues:

• MGMT-17419
• MGMT-17420
• MGMT-17423

/cc @yevgeny-shnaidman @chr15p

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qbarrand

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• OWNERS [qbarrand]

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[qbarrand]

/hold
I will reference more issues that this PR fixes.

/cherry-pick release-2.1

[openshift-cherrypick-robot]

@qbarrand: once the present PR merges, I will cherry-pick it on top of release-2.1 in a new PR and assign it to you.

In response to this:

/hold
I will reference more issues that this PR fixes.

/cherry-pick release-2.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[qbarrand]

/unhold
Will actually close further Jiras as duplicate. Please lgtm.

[qbarrand]

/retest

[qbarrand]

/retest

[qbarrand]

/retest

[qbarrand]

/retest

[qbarrand]

/retest

[qbarrand]

/retest

[mresvanis]

/lgtm

[openshift-cherrypick-robot]

@qbarrand: new pull request created: #1074

In response to this:

/hold
I will reference more issues that this PR fixes.

/cherry-pick release-2.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.