Fix typo.
Use in_localip() instead of handmade implementation.

MFC after:	1 week
Sponsored by:	Yandex LLC
Print human-readable error for "route not found" case.

Submitted by:	vsevolod (initial version)
MFC after:	2 weeks
Sponsored by:	Yandex LLC
Add /etc/rc.d/initrandom, which was removed in r273872.

Noticed by:	ache@
Fix usage of kern_getenv().
Remove the check for packets with broadcast source from if_gif's encapcheck.

The check was recommened in the draft-ietf-ngtrans-mech-05.txt. But it isn't
clear, should it compare the source with all direct broadcast addresses in the
system or not.
RFC 4213 says it is enough to verify that the source address is the address
of the encapsulator, as configured on the decapsulator. And this verification
can be extended by administrator with any other forms of IPv4 ingress filtering.

Discussed with:	glebius, melifaro
Sponsored by:	Yandex LLC
Use macro ERROUT() to make code more laconic and follow style of other
netgraph code.

Submitted by:	Dmitry Luhtionov <dmitryluhtionov gmail.com>