ssh: import binascii directly, instead of using it through base64 module It is unfortunate that the base64 module is leaking its binascii internals in exception types. We started using binascii through the base64 import in 08af13a090e0, but the import is not public, and pytype thus complains.

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.