written to use Python 2, both versions are supported in parallel for now
(with a -3 suffix on the command-line tools and some other files to avoid a
conflict).
Clean up dependencies which have not been used for some time while there;
PyCrypto and py-ecdsa changed to py-cryptography in 2017 and use of libdnet
was removed in 2.4.4.
ok bluhm@ (maintainer).
53db76e4dc