Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

rtsock: fix socket closure.

Currently `close(2)` erroneously return `EOPNOTSUPP` for `PF_ROUTE` sockets.
It happened after making rtsock socket implementation self-contained (
36b10ac2cd18 ). Rtsock

rtsock: fix socket closure.

Currently `close(2)` erroneously return `EOPNOTSUPP` for `PF_ROUTE` sockets.
It happened after making rtsock socket implementation self-contained (
36b10ac2cd18 ). Rtsock code marks socket as connected in `rts_attach()`.
`soclose()` tries to disconnect such socket using `.pr_disconnect` callback.
Rtsock does not implement this callback, resulting in the default method being
substituted. This default method returns `ENOTSUPP`, failing `soclose()` logic.

This diff restores the previous behaviour by adding custom `pr_disconnect()`
returning `ENOTCONN`.

Reviewed by: glebius
Differential Revision: https://reviews.freebsd.org/D38059

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tests: add routing tests for switching between same prefixes

Differential Revision: https://reviews.freebsd.org/D36055
MFC after: 2 weeks

routing: add multipath pytest tests

Differential Revision: https://reviews.freebsd.org/D31084

build: provide a default WARNS for all in-tree builds

The current default is provided in various Makefile.inc in some top-level
directories and covers a good portion of the tree, but doesn't cover p

build: provide a default WARNS for all in-tree builds

The current default is provided in various Makefile.inc in some top-level
directories and covers a good portion of the tree, but doesn't cover parts
of the build a little deeper (e.g. libcasper).

Provide a default in src.sys.mk and set WARNS to it in bsd.sys.mk if that
variable is defined. This lets us relatively cleanly provide a default WARNS
no matter where you're building in the src tree without breaking things
outside of the tree.

Crunchgen has been updated as a bootstrap tool to work on this change
because it needs r365605 at a minimum to succeed. The cleanup necessary to
successfully walk over this change on WITHOUT_CLEAN builds has been added.

There is a supplemental project to this to list all of the warnings that are
encountered when the environment has WARNS=6 NO_WERROR=yes:
https://warns.kevans.dev -- this project will hopefully eventually go away
in favor of CI doing a much better job than it.

Reviewed by: emaste, brooks, ngie (all earlier version)
Reviewed by: emaste, arichardson (depend-cleanup.sh change)
Differential Revision: https://reviews.freebsd.org/D26455

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Skip routing regression tests depending on if_epair if this module isn't installed.

Approved by: melifaro
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D24468

Switch rtsock tests to per-test jails and epair interfaces.

Many rtsock tests verify the ordering of the kernel messages for the
particular event. In order to avoid flaky tests due to the other tes

Switch rtsock tests to per-test jails and epair interfaces.

Many rtsock tests verify the ordering of the kernel messages for the
particular event. In order to avoid flaky tests due to the other tests
running, switch all tests to use personal vnet-enabled jails.
This removes all clashes on the IP addresses and brings back the ability
to run these tests simultaneously.

Reported by: olivier
Reviewed by: olivier
Differential Revision: https://reviews.freebsd.org/D24182

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Merge ^/head r356931 through r357118.

tests: Routing tests overwrote net tests

The routing subdirectory installed into the same directory as the test tests,
which caused them to overwrite the net Kyuafile. As a result these tests were
n

tests: Routing tests overwrote net tests

The routing subdirectory installed into the same directory as the test tests,
which caused them to overwrite the net Kyuafile. As a result these tests were
not executed.

X-MFC-With: r356146

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Add userland tests for route table/lltable rtsock operations.

MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D22860