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support for forwarding scenarios

See merge request !203

explicit outgoing addresses to make PCAPs easier to read

See merge request !205

Since migration to network namespaces PCAPs are harder to read because
source and destination addresses are always the same. This is AFAIK
caused by kernel routing and works as intended for real networks.

In our case all IP addresses are on local interfaces so we can
explicitly configure outgoing addresses in daemons and this will
again produce PCAPs where source address matches address assigned to
the daemon by Deckard.

At the moment Deckard assigns only one IPv4 or IPv6 address to binary
under test, i.e. this is not a complete fix: In cases where daemon has
IPv4 address assigned by Deckard but decides to contact IPv6 server it
will use the same address as source and destination.

Related: !169

workaround for incorrect EDNS buffer size handling in testserver

See merge request !204

Related: #66

Reintroduce a way to access other binaries' IP addresses

Closes #63

See merge request !202

Closes: #63

doc: don't recommend the deprecated -f parameter

See merge request !201

Non-numeric parameters don't seem to suffer from the problem in comment.

run.sh: properly handle pytest error codes

See merge request !200

pylnint: fix raise-missing-from W0707

See merge request !199

mock_client: randomize source port

See merge request !195

It enables us to distribute queries among more instances
on the same address (SO_REUSEPORT on the server side).

deckard: make conncheck optional

See merge request !196

Make connection check on daemon startup optional. It is useful for
testing combinations of binaries where some of them are only clients
or communicate with others via non-DNS protocols (like cache garbage
collector).

rplint improvements

See merge request !194

As far as I can tell self.fields was not used outside of this function
so I removed it.

allow verbose logging under xdist

See merge request !193

It is not clear why 8e9f5639 disallowed
verbose logging under xdist. It seems to work with:
- python 3.8.5
- py.test 6.0.1
- xdist 1.34.0

Monotonic time tests

Closes #54

See merge request !189

this is done by appending `-monotonic` to the .rpl filename
e.g. `val_xyz-monotonic.rpl`

test for version kresd 5.1.3.

See merge request !192

resolver: adapt test val_dname_bogus to changes in knot-resolver!1020

bump jinja version to get rid of the deprecation warnings

See merge request !191

nit: remove deprecated option from deckard_pytest.ini

See merge request !190

introduce DECKARD_WRAPPER env variable for easier debugging

See merge request !188

introduce DECKARD_NOCLEAN environment variable

See merge request !187