Docker hosts report back mounts in container directories via snmp
storage queries
# php -q /usr/share/cacti/cli/add_graphs.php --host-id=585 --snmp-field=hrStorageDescr --list-snmp-values
Known values for hrStorageDescr for host 585: (name)
...
/var/lib/docker/containers/05ed2dc...
/var/lib/docker/containers/7cebed4...
/var/lib/docker/containers/f452861...
Because these can keep changing, hosts just end up getting more and
more invalid graphs in their results (see gitea0X hosts in cacti at
the moment).
Filter out docker directories from the query
Change-Id: Ia1db628975e7a67ad531438ef85735abae1ce652
5686508716