K 10
svn:author
V 3
eri
K 8
svn:date
V 27
2015-07-29T18:04:01.953715Z
K 7
svn:log
V 564
ip_output normalization and fixes

ip_output has a big chunk of code used to handle special cases with pfil consumers which also forces a reloop on it.
Gather all this code together to make it readable and properly handle the reloop cases.

Some of the issues identified:

M_IP_NEXTHOP is not handled properly in existing code.
route reference leaking is possible with in FIB number change
route flags checking is not consistent in the function

Differential Revision:	https://reviews.freebsd.org/D3022
Reviewed by:	gnn
Approved by:	gnn(mentor)
MFC after:	4 weeks

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