RMQ 3.7.9 added a header to the list_vhosts output
RMQ 3.7.9 added a header to the list_vhosts output

The script assumed there was just a list of vhosts, without any headers.

[#162156302]

Co-authored-by: Michal Kuratczyk <304440fa11254af9197fe70f6c35e6528f26afc4@pivotal.io>

pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release