Fix invalid openshift_master_audit_config in hosts.example

[vrutkovs]

Sample setting for openshift_master_audit_config has incorrect syntax - int vars should be quoted, path should be in one of the mounted dirs

Related to https://bugzilla.redhat.com/show_bug.cgi?id=1589063

[sdodson]

/lgtm
/retest
/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.

In response to this:

/lgtm
/retest
/cherrypick release-3.10

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[sdodson]

/retest

[openshift-cherrypick-robot]

@sdodson: new pull request created: #8843

In response to this:

/lgtm
/retest
/cherrypick release-3.10

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.