fix linters

Partial-Fix: https://bugs.launchpad.net/tripleo/+bug/1848512
Change-Id: I460f5593b66c073a75b713bac848dcd66b639e9c

bindep.txt

@@ -31,3 +31,6 @@ gzip
 # Required to build language docs
 gettext
 
+# debian requirements (linters)
+libffi-dev        [platform:dpkg]
+libssl-dev        [platform:dpkg]

tox.ini

@@ -19,9 +19,12 @@ setenv =
     PIP_DISABLE_PIP_VERSION_CHECK=1
 passenv =
     ANSIBLE_*
+    CURL_CA_BUNDLE
     DOCKER_*
     PYTEST*
+    REQUESTS_CA_BUNDLE
     SSH_AUTH_SOCK
+    SSL_CERT_FILE
     TERM
 install_command = pip install {opts} {packages}
 deps =
@@ -77,7 +80,10 @@ commands =
 
 [testenv:linters]
 skip_install = true
-deps = pre-commit
+deps =
+    # workaround for https://github.com/ansible/ansible-lint/issues/590
+    virtualenv==16.3.0 # 16.7.6 not working
+    pre-commit
 commands =
     python -m pre_commit run -a {posargs:}
     bash -c tools/check_duplicate_jinja_blocks.sh