contrail-satutus command doesn't work on Contrail 21.4.L4, with docker-ce 18.06.3 on Ubuntu.

With the older docker-ce package, contrail-status fails with the following error.

root@contrail-compute:~# contrail-status
unknown flag: --cgroupns
See 'docker run --help'.

This is a regression issue due to an enhancement done, which added the "--cgroupns host" option in /usr/bin/contrail-status binary, which only works with docker 20.10 or later.

The issue is addressed in future releases of contrail.