Deal setuptools upgrade problem discussed here:
https://github.com/pypa/setuptools/issues/940
Now follows the same formula as upstream teuthology.
Signed-off-by: Matt Benjamin <mbenjamin@redhat.com>
# avoid pip bugs
./virtualenv/bin/pip install --upgrade pip
-# work-around change in pip 1.5
-./virtualenv/bin/pip install setuptools --no-use-wheel --upgrade
+# work-around change in pip 1.5 (and more recent)
+./virtualenv/bin/pip install setuptools --upgrade
./virtualenv/bin/pip install -r requirements.txt