There is no indication to the user in the command
help that they have to use 2.17 or greater [1] to run
the "openstack server dump create" command. This
mentions that requirement in the help of the command.
[1] https://developer.openstack.org/api-ref/compute/#trigger-crash-dump-in-server
Change-Id: I02c06e10a26eb38ddecb70f970cfcbfad962201c