if_ovpn tests: allow these tests to run in parallel

Now that kyua can isolate tests in their own vnets we can run these tests in
parallel.

Reviewed by: markj
Sponsored by: Rubicon Communications, L

if_ovpn tests: allow these tests to run in parallel

Now that kyua can isolate tests in their own vnets we can run these tests in
parallel.

Reviewed by: markj
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D46600

(cherry picked from commit a05decec2d194821f8bf5c8f2ae72063de0c87a8)

Approved by: kp (mentor), markj (mentor)

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if_vlan: handle VID conflicts

If we fail to change the vlan id we have to undo the removal (and vlan id
change) in the error path. Otherwise we'll have removed the vlan object from the
hash table, a

if_vlan: handle VID conflicts

If we fail to change the vlan id we have to undo the removal (and vlan id
change) in the error path. Otherwise we'll have removed the vlan object from the
hash table, and have the wrong vlan id as well. Subsequent modification attempts
will then try to remove an entry which doesn't exist, and panic.

Undo the vlan id modification if the insertion in the hash table fails, and
re-insert it under the original vlan id.

PR: 279195
Reviewed by: zlei
MFC atfer: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D45285

(cherry picked from commit bdd12889eaa64032b3d09ef47e9a6f7081863378)

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vnet tests: check for if_bridge.ko

A number of tests create a bridge, but did not check if if_bridge.ko is loaded.

We usually get away with that, because `ifconfig bridge create` autoloads the
modu

vnet tests: check for if_bridge.ko

A number of tests create a bridge, but did not check if if_bridge.ko is loaded.

We usually get away with that, because `ifconfig bridge create` autoloads the
module, but if we run the tests in a jail (e.g. because of kyua's upcoming
execenv.jail.params feature) we can't load the module and these tests can fail.

Check if the module is loaded, skip the test if it is not.

Reviewed by: markj
MFC after: 1 week
Event: Kitchener-Waterloo Hackathon 202406
Differential Revision: https://reviews.freebsd.org/D45487

(cherry picked from commit 480ad4055314efbfff7eedbb34272031d836ba89)

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