Add `missing` and `or-flush` options to "ipfw table <NAME> create" command to simplify firewall reloading. The `missing` option suppresses EEXIST error code, but does check that existing table has the same parameters as new one. The `or-flush` option implies `missing` option and additionally does flush for table if it is already exist. Submitted by: lev Differential Revision: https://reviews.freebsd.org/D18339
Remove unused token that was added in r348235.