[JIRA] (OVIRT-2133) Explain how to remove a stale OST env

Explain how to remove a stale OST env ------------------------------------- Key: OVIRT-2133 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-2133 Project: oVirt - virtualization made easy Issue Type: Bug Components: OST Reporter: Gal Ben Haim Assignee: Galit Rosenthal If the lago prefix was removed without calling `lago destroy`, stale networks and VMs can be still running on the host. If so, the following error might occur: {code:java} libvirtError: internal error: Network is already in use by interface SOME INTERFACE NAME {code}