Summary:
In preparation of making if_t completely opaque outside of the netstack,
explicitly include the header. <net/if_var.h> will stop including the
header in the future.
Sponsored by: Juniper Networks, Inc.
Reviewed by: glebius, melifaro
Differential Revision: https://reviews.freebsd.org/D38200
When ALTQ is enabled ifnet accessors already need to be called, largely
defeating the purpose of the inline. To that extent, make the ALTQ form
functions in the netstack proper, and make them always available.
Reviewed By: glebius
Sponsored by: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D38104
