tox: Integrate 'flake8wrap' script

Integrate the 'flake8wrap' scripts, which provide useful functionality.

Change-Id: I06d7d9d816d855b6ce4f1748b29a3ed916e3bbf8
Partial-Bug: #1535772

tools/flake8wrap.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# A simple wrapper around flake8 which makes it possible
+# to ask it to only verify files changed in the current
+# git HEAD patch.
+#
+# Intended to be invoked via tox:
+#
+#   tox -epep8 -- -HEAD
+#
+
+if test "x$1" = "x-HEAD" ; then
+    shift
+    files=$(git diff --name-only HEAD~1 | tr '\n' ' ')
+    echo "Running flake8 on ${files}"
+    diff -u --from-file /dev/null ${files} | flake8 --diff "$@"
+else
+    echo "Running flake8 on all files"
+    exec flake8 "$@"
+fi

tox.ini

@@ -5,14 +5,17 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
-setenv =
-    PYTHONPATH = {toxinidir}:{toxinidir}/intel_nfv_ci_tests
+whitelist_externals = bash
+                      find
+                      rm
 deps =
     -r{toxinidir}/test-requirements.txt
+commands =
+  find . -type f -name "*.pyc" -delete
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:pep8]
-commands = flake8
+commands = bash tools/flake8wrap.sh {posargs}
 
 [testenv:venv]
 commands = {posargs}