Add oslo.concurrentcy to requirements

Author: mfeurer

ci_scripts/install.sh

@@ -29,6 +29,7 @@ conda create -n testenv --yes python=$PYTHON_VERSION pip nose \
    scikit-learn=$SKLEARN_VERSION pandas
 source activate testenv
 
+pip install oslo.concurrency
 pip install matplotlib jupyter notebook nbconvert nbformat jupyter_client ipython ipykernel
 if [[ "$COVERAGE" == "true" ]]; then
     pip install codecov

requirements.txt

@@ -7,4 +7,5 @@ nose
 requests
 scikit-learn>=0.18
 nbformat
-python-dateutil
+python-dateutil
+oslo.concurrency