[CI] Drop bindep

It is not necessary and it may be confusing.

Change-Id: Ie84bce6a90de622dc76a2309fc579d881325b956

bindep.txt

@@ -1,8 +0,0 @@
-libffi-dev [platform:dpkg]
-libffi-devel [platform:rpm]
-gcc [platform:rpm]
-gcc [platform:dpkg]
-python3-dev [platform:dpkg]
-python3-devel [platform:rpm]
-openssl-devel [platform:rpm]
-libssl-dev [platform:dpkg]

tests/playbooks/pre.yml

@@ -1,7 +1,5 @@
 ---
 - hosts: all
-  roles:
-    - bindep
   vars_files:
     - ../vars/zuul.yml
   tasks:

tox.ini

@@ -88,14 +88,6 @@ commands =
   rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
-[testenv:bindep]
-# Do not install any requirements. We want this to be fast and work even if
-# system dependencies are missing, since it's used to tell you what system
-# dependencies are missing! This also means that bindep must be installed
-# separately, outside of the requirements files.
-deps = bindep
-commands = bindep test
-
 [flake8]
 show-source = True
 enable-extensions = H203,H106