Commands that use the table library, such as ovs-vsctl and  "ovsdb-client
dump", print trailing white space in tabular output, to fill out the entire
width of their tabular columns.  This is annoying whenever we use these
commands in the test infrastructure, since we have to specially mark the
trailing white space in Autotest with a "@&t@" marker at the end of the
line.  This commit gets rid of the trailing white space and the annoying
"@&t@" markers.

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