K 10
svn:author
V 5
hiren
K 8
svn:date
V 27
2015-05-08T08:35:06.578372Z
K 7
svn:log
V 397
MFC r261708, r261847, r268525, r274316, r274347, r275593,
    r276844, r276847, r279531, r279559, r279564, r279676

A bunch of IPv6 fixes by melifaro, hrs and ae

Major changes:
Simplify nd6_output_lle()
Add refcounting to DAD and fix races and other errors
Implement Enhanced DAD algorithm for IPv6

Suggested by: 	ae
Tested by: 	Jason Wolfe <j at nitrology.com>
Sponsored by:	Limelight Networks

END