Install pip for Python3.4 for gcov tests

templates/tools/dockerfile/test/multilang_jessie_x64/Dockerfile.template

@@ -25,6 +25,10 @@
   <%include file="../../php_deps.include"/>
   <%include file="../../ruby_deps.include"/>
   <%include file="../../python_deps.include"/>
+  # Install pip and virtualenv for Python 3.4
+  RUN curl https://bootstrap.pypa.io/get-pip.py | python3.4
+  RUN python3.4 -m pip install virtualenv
+  
   # Install coverage for Python test coverage reporting
   RUN pip install coverage
   ENV PATH ~/.local/bin:$PATH

tools/dockerfile/test/multilang_jessie_x64/Dockerfile

@@ -144,6 +144,10 @@ RUN pip install --upgrade pip==10.0.1
 RUN pip install virtualenv
 RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.5.2.post1 six==1.10.0 twisted==17.5.0
 
+# Install pip and virtualenv for Python 3.4
+RUN curl https://bootstrap.pypa.io/get-pip.py | python3.4
+RUN python3.4 -m pip install virtualenv
+
 # Install coverage for Python test coverage reporting
 RUN pip install coverage
 ENV PATH ~/.local/bin:$PATH