This commit adds following enhancement for controller filesystem
extension:
- Add a new column/row to show the size of available space in the
volume group in host-lvg-list and host-lvg-show command output.
This will help user know how much space is available to extend
controller filesystem.
- Remove the 2G space reservation when calculating available space
in cgts-vg volume group.
- Remove the unused code when calculating available space in cgts-vg
volume group.
- Reduce the required cgts-vg space on standby controller by 2G when
unlocking the standby controller for the first time.
Change-Id: Ic94a3544a9d02f67c592e07048b95135c2b350ed
Closes-Bug: 1804711
Signed-off-by: Wei Zhou <wei.zhou@windriver.com>