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New option --noclean prevents deleting temp working directory
with passed test. Can be used for debugging.

refs #3

Right now I'm not aware of any reason to invest into Python 2 any further.

RFC 5011 implementation in kresd and Unbound require separate
trust anchor file for each domain.

The setup was in too long functions and too hard to debug.
Side-effect is that we can now easily print path to working directory
after a failure.

This helps debugging problems with missing definitions because you can
look into PCAP.

Deckard now can run multiple processes inside single simulated network
and communicate with each other.

This introduces couple of incompatible changes:
- command line syntax was changed to accomodate new possibilities (see --help)
- SOCKET_WRAPPER environment variables except DIR are always managed by Deckard

Testserver already had all the information so it was unnecessary to pass
them again. The improved TestServer.start() method is going to be
handy in future.

kresd by default runs in normal mode so from now on tests default to
normal mode as well.

The option is equivalent to Unbound's harden-glue.
For kresd it is translated as follows:
- "on"  = kresd mode "normal",
- "off" = kresd mode "permissive".

This follows the same behavior as testbound.

The option allows or disallows queries for localhost NS addresses.
If not specified, queries for localhost addresses are forbidden.

The double negative was driving me crazy so when I was changing the code
parameter processing code path I changed replaced boolean NO_MINIMIZE
with QMIN.

This change will simplify our lives later on.

Socket family selectino logic was unnecessarily duplicated several times.

Trivial changes to pythonify boolean expressions and avoid pep8 error E712
"comparison to True should ..."

Cheap re-indentation using python-autopep8-1.2.1-3.fc25 with few manual
tweaks for very long lines.

This costs nothing and will avoid PEP8 complaints about whitespace in CI.

Cheap re-indentation using reindent.py from python-2.7.13.
This costs nothing and will avoid PEP8 complaints about tabs in CI.

Linux distributions are moving towards Python 3. As a consequence,
staying on Python 2 is causing problems. E.g. Deckard errored out
on missing 'dns' package but 'pip install' claimed that 'dns' is already
installed...

From now the Deckard is using default Python version so it should be
less surprising. If necessary, the default version can be overriden
using PYTHON variable in Makefile.

An important side-effect is that Deckard running under Python 3 is
easier to debug because Python 3 is able to report whole chains
of exceptions properly.

The main problem was that socket.type from Python standard library is
not an integer anymore. It is EnumInt object which is used instead of
bit field. To make the code compatible with both versions of Python we
had to replace all exact value comparisons with bitwise masking.

Custom implementation of packet logging was replaced by
SOCKET_WRAPPER_PCAP_FILE facilities. The main advantage is that it logs
all the traffic including malformed packets, ICMP messages and so on.

As side-effect, this commit removes depedency on Python package dpkt.

Power DNS recursor terminates with non-zero exit code after receiving
SIGTERM so we need to ignore this condition.

Normally the server process should exit with code 0. Non-zero might
indicate crash during shutdown or so.

This can be used for automated Valgrind testing:
$ make DAEMON=valgrind ADDITIONAL="--error-exitcode=1 kresd"

Multiple IPv4/IPv6 addresses can be specified for single RANGE.
This allows to specify responses for zones with multiple
name servers without copy-pasting the data for each server's address.