use python27 specific pip in python dockerfiles

templates/tools/dockerfile/apt_get_python_27.include

@@ -1,3 +1,3 @@
 # Install Python 2.7
 RUN apt-get update && apt-get install -y python2.7 python-all-dev
-RUN curl https://bootstrap.pypa.io/get-pip.py | python2.7
+RUN curl https://bootstrap.pypa.io/2.7/get-pip.py | python2.7

templates/tools/dockerfile/python_deps.include

@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y ${'\\'}
     python-setuptools
 
 # Install Python packages from PyPI
-RUN curl https://bootstrap.pypa.io/get-pip.py | python2.7
+RUN curl https://bootstrap.pypa.io/2.7/get-pip.py | python2.7
 RUN pip install --upgrade pip==19.3.1
 RUN pip install virtualenv==16.7.9
 RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.5.2.post1 six==1.15.0 twisted==17.5.0