Fixed ImportError for dist_info by removing duplicate setuptools

Signed-off-by: Andreas Maier <maiera@de.ibm.com>

Makefile

@@ -214,10 +214,9 @@ endif
 
 .PHONY: _pip
 _pip:
-	@echo 'Installing/upgrading pip, setuptools and wheel with PACKAGE_LEVEL=$(PACKAGE_LEVEL)'
-	$(PIP_CMD) install $(pip_level_opts) pip
-	$(PIP_CMD) install $(pip_level_opts) setuptools
-	$(PIP_CMD) install $(pip_level_opts) wheel
+	$(PYTHON_CMD) remove_duplicate_setuptools.py
+	@echo 'Installing/upgrading pip, setuptools, wheel and pbr with PACKAGE_LEVEL=$(PACKAGE_LEVEL)'
+	$(PYTHON_CMD) -m pip install $(pip_level_opts) pip setuptools wheel pbr
 
 .PHONY: setup
 develop: _pip requirements.txt dev-requirements.txt os_setup.sh $(ansible_repo_dir)

remove_duplicate_setuptools.py

@@ -0,0 +1,60 @@
+#!/bin/env python
+"""
+This script removes duplicated dist-info directories of setuptools, which
+happen to exist on the Travis CI in their Ubuntu 14.04 (trusty) distro:
+  site-packages/setuptools                  <- contains 36.3.0
+  site-packages/setuptools-36.0.1.dist-info <- duplicate to be removed
+  site-packages/setuptools-36.3.0.dist-info
+"""
+
+import sys
+import os
+import re
+import glob
+import importlib
+import shutil
+
+
+def remove_duplicate_metadata_dirs(package_name):
+    """Remove duplicate metadata directories of a package."""
+
+    print("Removing duplicate metadata directories of package: {}".
+          format(package_name))
+
+    module = importlib.import_module(package_name)
+
+    py_mn = "{}.{}".format(*sys.version_info[0:2])
+    print("Current Python version: {}".format(py_mn))
+
+    version = module.__version__
+    print("Version of imported {} package: {}".format(package_name, version))
+
+    site_dir = os.path.dirname(os.path.dirname(module.__file__))
+    print("Site packages directory of imported package: {}".format(site_dir))
+
+    metadata_dirs = []
+    metadata_dirs.extend(glob.glob(os.path.join(
+        site_dir, '{}-*.dist-info'.format(package_name))))
+    metadata_dirs.extend(glob.glob(os.path.join(
+        site_dir, '{}-*-py{}.egg-info'.format(package_name, py_mn))))
+
+    for d in metadata_dirs:
+
+        m = re.search(r'/{}-([0-9.]+)(\.di|-py)'.format(package_name), d)
+
+        if not m:
+            print("Warning: Could not parse metadata directory: {}".format(d))
+            continue
+
+        d_version = m.group(1)
+
+        if d_version == version:
+            print("Found matching metadata directory: {}".format(d))
+            continue
+
+        print("Removing duplicate metadata directory: {}".format(d))
+        shutil.rmtree(d)
+
+
+if __name__ == '__main__':
+    remove_duplicate_metadata_dirs('setuptools')