This commit creates docker-lv in the automatically created cgts-vg
volume group on the worker nodes if kubernetes is configured. It
also supports cgts-vg expansion.
This commit also increases docker-lv size to 30G for all the hosts.
Story: 2004520
Task: 28663
Depends-On: https://review.openstack.org/628053
Change-Id: I9b53421318883d0e951d64d0be91e146d14e5d7b
Signed-off-by: Wei Zhou <wei.zhou@windriver.com>