The provided server acknowledges the deletion of all plugins marked as deleted by calling this method. Once all the servers in the HA cloud acknowledge the deletion of a plugin and the plugin is made purgable (after its resource types are deleted, etc) it will be automatically purged from the database.
This method is not meant for "public" consumption and is only called from {@link org.rhq.enterprise.server.core.plugin.AgentPluginScanner}.
@param serverId the id of the server that wants to acknowledge that it has seen the deleted plugins