If the charm code is passed symlinks to block devices (as is often the
case with newer MAAS substrate versions), resolve links before
attempting to use the block device for storage.
Charmhelpers were updated as well.
Testing done:
- Unit tests pass
- Tests pass
- Multiple Openstack Autopilot deployments pass
Change-Id: If966239502d0752c86e46f3f0aee96f43828aa08
Closes-Bug: 1577408
Signed-off-by: Chris Glass <chris.glass@canonical.com>