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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.

This fixes installations where python3 is the default.

STEP <id> is optional (incremented if ommited)
e.g.:
STEP 1 REPLY # Id=1
STEP REPLY   # Id=2

CONFIG_END isn't needed
ENTRY_END isn't needed

the pydnstest is a generic library
scenario is not responsible for any socket binding
testserver provides mock servers
deckard picks eligible addresses from scenario,
and tells testserver to listen there

this makes the library standalone useable even
without prebinding