Add command to update and print FDB entries with NTF_SELF and
NTF_MASTER set.

Example usages illustrating use of 'self' to program embedded
forwarding table and 'master' to configure the forwarding table
of the bridge. Also shows 'master self' used to update both in
the same command.

#./br/br fdb add 00:1b:21:55:23:60 dev eth3 self
#./br/br fdb add 00:1b:21:55:23:60 dev eth3 master
#./br/br fdb add 00:1b:21:55:23:61 dev eth3 self master
#./br/br fdb add 00:1b:21:55:23:62 dev eth3
#./br/br fdb show
eth3    00:1b:21:55:23:60       local self
eth3    00:1b:21:55:23:61       local self
eth3    33:33:00:00:00:01       local self
eth3    01:00:5e:00:00:01       local self
eth3    33:33:ff:55:23:59       local self
eth3    01:00:5e:00:00:fb       local self
eth33   33:33:00:00:00:01       local self
eth34   33:33:00:00:00:01       local self
eth3    00:1b:21:55:23:59       local master
eth3    00:1b:21:55:23:60       static master
eth3    00:1b:21:55:23:62       static master
eth3    00:1b:21:55:23:61       static master
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>