Fix pyenv dockerfile

templates/tools/dockerfile/apt_get_pyenv.include

@@ -12,6 +12,9 @@ RUN apt-get update && apt-get install -y ${'\\'}
 
 # Install Pyenv and dev Python versions 3.5 and 3.6
 RUN curl -L https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash
+ENV PATH /root/.pyenv/bin:$PATH
+RUN eval "$(pyenv init -)"
+RUN eval "$(pyenv virtualenv-init -)"
 RUN pyenv update
 RUN pyenv install 3.5-dev
 RUN pyenv install 3.6-dev

tools/dockerfile/push_testing_images.sh

@@ -44,7 +44,7 @@ cd -
 
 DOCKERHUB_ORGANIZATION=grpctesting
 
-for DOCKERFILE_DIR in tools/dockerfile/test/fuzzer tools/dockerfile/test/sanity
+for DOCKERFILE_DIR in tools/dockerfile/test/*
 do
   # Generate image name based on Dockerfile checksum. That works well as long
   # as can count on dockerfiles being written in a way that changing the logical 

tools/dockerfile/test/python_pyenv_x64/Dockerfile

@@ -92,6 +92,9 @@ RUN apt-get update && apt-get install -y \
 
 # Install Pyenv and dev Python versions 3.5 and 3.6
 RUN curl -L https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash
+ENV PATH /root/.pyenv/bin:$PATH
+RUN eval "$(pyenv init -)"
+RUN eval "$(pyenv virtualenv-init -)"
 RUN pyenv update
 RUN pyenv install 3.5-dev
 RUN pyenv install 3.6-dev