This is usually the way etcdctl displays member IDs. This makes it more
intuitive and easier to correlate with etcdctl's output.

Signed-off-by: Tom Wieczorek <[email protected]>
(cherry picked from commit a8ce70b)
(cherry picked from commit dfb5bfd)
(cherry picked from commit 88d956d)

The etcd leave subcommand can be used to remove k0s nodes from the etcd
cluster. If no IP address is specified, the default is to remove the
current node. The IP of the node to be removed can be specified with
the --peer-address flag. However, it's quite tempting to just pass the
IP as an argument, like this `k0s etcd drop 192.168.0.0.3`. This extra
argument will simply be ignored, and the leave subcommand will use its
defaults. This can be _very_ confusing, and also quite dangerous, as it
may remove _different_ nodes than intended.

Improve the subcommand by making it fail if arguments are passed to it.
Add validation to the --peer-address flag and improve the usage strings.
While at it, make the etcd member-list subcommand reject any args as
well.

Signed-off-by: Tom Wieczorek <[email protected]>
(cherry picked from commit 477d354)
(cherry picked from commit 6a19b5f)
(cherry picked from commit ff33c56)