ovn-sbctl: Adjust formatting of lflow-list.

ovn-sbctl: Adjust formatting of lflow-list.

Adjust the field width for a couple of elements in the output of the
lflow-list sub-command of ovn-sbctl. We now have a table ID of 10, so
set a field width of 2 to keep output aligned. Table names have grown to
a max of 19 characters, so update the field width to keep output
aligned.  Finally, left justify values in fields, as I find that to look
a little nicer.

Also update sample output in OVN-Tutorial.md to match the current state.

Signed-off-by: Russell Bryant <russell@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>