FreeBSD/src 05ab1ef (r348235)sbin/ipfw tables.c ipfw.8

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
MFC after:      2 weeks
Differential Revision:  https://reviews.freebsd.org/D18339
DeltaFile
+33-5sbin/ipfw/tables.c
+9-2sbin/ipfw/ipfw.8
+3-0sbin/ipfw/ipfw2.h
+45-73 files

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