[stable/rabbitmq] Fix breaking bitnami based RabbitMQ vhost configuration

[colingabr]

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[colingabr]

I signed the CLA

[colingabr]

/assign @tompizmo

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[colingabr]

Here's some background: #2853

[unguiculus]

/assign @tompizmor @sameersbn

[unguiculus]

/ok-to-test

[sameersbn]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: novcn, sameersbn

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