* Revert "Pin python-augeas version to avoid error with 1.0.0 (#4422)"

This reverts commit 1c51ae25.

* make dependency-requirements

* separate certbot and dependency requirements

* fix build.py

* update hashin comment

* simplify release pinning

* separate letsencrypt dependency

* pin hashes in venv

* error out when bad things happen

* use pinned dependencies in tox

* Revert "pin hashes in venv"

This reverts commit 1cd38a9e50da94e6959728bf57aaf642807bc9c7.

* use pip_install.sh in venv_common

* quote pip install args

* bump mock version