workaround on setuptool installation

Reference to conda issue ContinuumIO/anaconda-issues#542

dockerfiles/Dockerfile

@@ -67,10 +67,10 @@ RUN  conda info -a  && \
 
 RUN /bin/bash -c 'source  activate test'  
 # The default sip version has api that is not compatible with qt4.
+RUN curl https://bootstrap.pypa.io/ez_setup.py -o - | python
 RUN    conda install --yes numpy scipy matplotlib pip nose vtk sip=4.18 
 RUN    pip install pip --upgrade
 RUN    conda install --yes -c https://conda.anaconda.org/dlr-sc pythonocc-core  &&\
-    pip install setuptools --upgrade && \
     pip install cython --upgrade &&\
     pip install enum34 && \
     pip install numpy-stl && \