ipset-translate: allow invoking with a path name

ipset-translate: allow invoking with a path name

Executing /usr/sbin/ipset-translate results in the ipset functionality being run, rather than the ipset-translate functionality.

 # ipset-translate destroy fred
 This command is not supported, use `ipset-translate restore < file'

 # /usr/sbin/ipset-translate destroy fred
 ipset v7.15: The set with the given name does not exist

use basename() to resolve the issue.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1626
Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>