git: ifq: Switch to drop-head for default enqueue method.

[Sepherosa Ziehau]

commit 2739afc4cdfc4e0354e5f99f69b5f3b254c9a90d
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Fri Jan 6 22:51:06 2017 +0800

    ifq: Switch to drop-head for default enqueue method.
    
    This is consistent w/ upcoming CoDel support.

Summary of changes:
 sys/net/if.c | 41 +++++++++++++++++++++++++----------------
 1 file changed, 25 insertions(+), 16 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/2739afc4cdfc4e0354e5f99f69b5f3b254c9a90d


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