testing: improve python vnet wrapper.

* Derive jail name from class name and method name, instead of just
method name. This change reduces the chances of different tests
clashing.
Old: 'jail_test_o

testing: improve python vnet wrapper.

* Derive jail name from class name and method name, instead of just
method name. This change reduces the chances of different tests
clashing.
Old: 'jail_test_one'. New: 'pytest:TestExampleSimplest:test_one'
* Simplify vnetX_handler() method signature by skipping obj_map (unused)
and pipe. The latter can be accessed as the vnet property.
* Add `send_object()` method as a pair to the `wait_object` inside the
VnetTestTemplate class.
* Add `test_id` property to the BaseTest method. Previously it was
provided only for the VnetTestTemplate class. This change makes
the identifier easily accessible for all users.

MFC after: 2 weeks

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netinet6: fix interface handling for loopback traffic

Currently, processing of IPv6 local traffic is partially broken:
link-local connection fails and global unicast connect() takes
3 seconds to c

netinet6: fix interface handling for loopback traffic

Currently, processing of IPv6 local traffic is partially broken:
link-local connection fails and global unicast connect() takes
3 seconds to complete.
This happens due to the combination of multiple factors.
IPv6 code passes original interface "origifp" when passing
traffic via loopack to retain the scope that is mandatory for the
correct hadling of link-local traffic. First problem is that the logic
of passing source interface is not working correcly for TCP connections,
resulting in passing "origifp" on the first 2 connection attempts and
lo0 on the subsequent ones. Second problem is that source address
validation logic skips its checks iff the source interface is loopback,
which doesn't cover "origifp" case.
More detailed description is available at https://reviews.freebsd.org/D35732

Fix the first problem by untangling&simplifying ifp/origifp logic.
Fix the second problem by switching source address validation check to
using M_LOOP mbuf flag instead of interface type.

PR: 265089
Reviewed by: ae, bz(previous version)
Differential Revision: https://reviews.freebsd.org/D35732
MFC after: 2 weeks

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netinet6: factor out cached route lookups from selectroute().

Currently selectroute() contains two nearly-identical versions of
the route lookup logic - one for original destination and another
for

netinet6: factor out cached route lookups from selectroute().

Currently selectroute() contains two nearly-identical versions of
the route lookup logic - one for original destination and another
for the case when IPV6_NEXTHOP option was set on the socket.

Factor out handling these route lookups in a separation function to
improve readability.
This change also fixes handling of link-local IPV6_NEXTHOPs.

Differential Revision: https://reviews.freebsd.org/D35710
MFC after: 2 weeks

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netinet6: add ip6_output() scope tests

Differential Revision: https://reviews.freebsd.org/D35742

netinet6: add ip6_output() tests.

Differential Revision: https://reviews.freebsd.org/D35708