LXC TEMPLATE WILL CREATE MOUNT

Lxc driver was throwing errors for mounts where the mount point does not exist in the container.
This adds a create=dir/file mount option to the lxc template, to alleviate this issue.

Docker-DCO-1.1-Signed-off-by: Abin Shahab <ashahab@altiscale.com> (github: ashahab-altiscale)
Merge pull request #9039 from ashahab-altiscale/8617-lxc-volume

Have lxc create mount points if they don't exist