Configure disks for hp cloud instances
Configure disks for hp cloud instances

Nodepool sometimes provides an hp cloud instance that has the majority
of space in /dev/vdb which is mounted at /mnt. This patch repurposes
that partition as an lvm VG for containers.

Also:
 * creates an LV for /opt and mounts that.
 * outputs some instance info that may be useful for debugging

Closes-Bug: #1407647

Change-Id: I91a6ab3994be348b17caaf9c9200d84463076d87

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