Fix bug in get_metadata function in vhost.erl module.

[mnxumalo]

Proposed Changes

The get_metadata function in the vhost module has a bug. It calls vhost_v1:get_limits() instead of vhost_v1:get_metadata(). This pull request is for fixing the above mentioned bug.

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[michaelklishin]

Thank you!

[michaelklishin]

Backported to v3.8.x.