rplint: fix check for shadowing entries

See merge request !135

It caused false positives when using `MATCH subdomain` before.

matchpart: fix handling of empty question sections

See merge request !125

notify user when Deckard is running under load

See merge request !133

Deckard's responses to resolvers might be delayed due to load which leads the resolver to close the port and to the test failing in the end. We partially detect these by checking the PCAP for ICMP packets.

Don't fake monotonic timers

See merge request !132

Running this test properly requires faking monotonic timers which breaks other tests. It will be added back once we figure out the way to fake monotonic and wall-clock time separately.

libswrap: fix PCAP generation

See merge request !131

tools: scripts for sorting new (imported) tests

See merge request knot/deckard!93

dealing with signatures using dnspython,
symlink from deckard/tools to deckard/pydnstest to import modules
consistent output format

recomendations to divide_tests.sh from comments of 11b5b7fe

Update documentation - match all

See merge request knot/deckard!129

ci: use Docker image with libknot 2.7

See merge request !130

logging: fix output for both Python 3.5 and 3.6+

See merge request !128

Use selectors instead of select

See merge request !126

logging: print Deckard errors in pytest output again

See merge request !127

--log-level=40 (errors) is now default for `run.sh` script.
This can be changed using --log-level option (--log-level=10 for full log) when running `*run.sh` scripts or using VERBOSE environment variable.

`rplint` refactor

See merge request !120