Deckard: Use default Python version from system
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.
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