K 10
svn:author
V 3
rrs
K 8
svn:date
V 27
2015-11-10T14:49:32.962496Z
K 7
svn:log
V 242
Add new async_drain to the callout system. This is so-far not used but
should be used by TCP for sure in its cleanup of the IN-PCB (will be coming shortly).

Sponsored by:	Netflix Inc.
Differential Revision:	https://reviews.freebsd.org/D4076

END