MFC r271970

ipv6 address for test.hosts.dots in wrong byte order.

Obtained from:	ipfilter CVS repo (r1.11), netbsd CVS repo (r1.5)
MFC r271971

Fix ipfilter bug #553 gethost needs to zero entire IP address structure.

Obtained from:	ipfilter CVS repo (r1.11)
MFC r271972

Fix ipfilter bug #536 ipnat can try to print rule as dstlist incorrectly.

Obtained from:	ipfilter CVS repo (r1.14), netbsd CVS repo (r1.3)
MFC r271974

ipfilter bug #551 ipf.conf address structure not properly zero filled.

Obtained from:	ipfilter CVS repo (r1.37), netbsd CVS repo (r1.3)
MFC r271977

3561691 gethost never returns an ipv6 address

Obtained from:	ipfilter CVS repo (r1.34), netbsd CVS repo (r1.4)