remove python testing in system packages

It not work with virtualenv

Author: ibotdotout

Dockerfile

@@ -11,12 +11,6 @@ RUN apt-get install -y python python-dev python-pip python-virtualenv
 RUN apt-get install -y python-opencv
 RUN apt-get install -y python-matplotlib
 
-# Python Testing packages.
-RUN pip install mock
-RUN pip install nose coverage rednose nose-cov nosexcover nose_xunitmp
-RUN pip install watchdog
-RUN pip install robotframework robotframework-pabot
-
 # Define working directory.
 WORKDIR /app