Handle audit log path in /var/log/origin

[rsevilla87]

This commit is intended to make the installer able to handle OpenShift audit log paths different from (/etc/origin/master, /var/lib/origin, /etc/origin/cloudprovider), which in most of cases are not appropriate since those directories are not usually used as log store.

The code included create a new directory /var/log/origin if auditFilePath is defined within this directory, and adds it as a hostPath in the apiserver static pod definition. custom module master_check_paths_in_config has been also properly tuned to allow this directories to be defined in the master-config.yaml

If accepted, this change should be properly documented.

More info: #10717

[openshift-ci-robot]

Hi @rsevilla87. Thanks for your PR.

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[papr-bot]

Can one of the admins verify this patch?
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[sdodson]

/lgtm
/cherrypick release-3.10

[openshift-cherrypick-robot]

@sdodson: once the present PR merges, I will cherry-pick it on top of release-3.10 in a new PR and assign it to you.

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In response to this:

/lgtm
/cherrypick release-3.10

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rsevilla87, sdodson

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[openshift-cherrypick-robot]

@sdodson: new pull request created: #10863

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In response to this:

/lgtm
/cherrypick release-3.10

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