ci: update builds to use Python 3 (#191)

Author: coryan

ci/kokoro/docker/Dockerfile.ubuntu

@@ -28,6 +28,7 @@ RUN apt-get update && \
         clang \
         cmake \
         curl \
+        ctags \
         doxygen \
         gawk \
         git \

ci/kokoro/docker/Dockerfile.ubuntu-install

@@ -29,6 +29,7 @@ RUN apt-get update && \
         clang \
         clang-format-7 \
         cmake \
+        ctags \
         curl \
         doxygen \
         gawk \
@@ -42,7 +43,8 @@ RUN apt-get update && \
         make \
         ninja-build \
         pkg-config \
-        python-pip \
+        python3 \
+        python3-pip \
         shellcheck \
         tar \
         unzip \
@@ -68,8 +70,8 @@ RUN chmod 755 /usr/bin/buildifier
 # Pin this to an specific version because the formatting changes when the
 # "latest" version is updated, and we do not want the builds to break just
 # because some third party changed something.
-RUN pip install --upgrade pip
-RUN pip install cmake_format==0.6.8
+RUN pip3 install --upgrade pip
+RUN pip3 install setuptools cmake_format==0.6.8
 
 # Install protobuf using CMake. Some distributions include protobuf, but gRPC
 # requires 3.4.x or newer, and many of those distribution use older versions.

doc/setup-development-environment.md

@@ -45,15 +45,9 @@ version is updated, and we do not want the builds to break just
 because some third party changed something.
 
 ```console
-sudo apt install -y python python-pip
-pip install --upgrade pip
-pip install numpy cmake_format==0.6.8
-```
-
-Install the Python modules used in the integration tests:
-
-```console
-pip install flask httpbin gevent gunicorn --user
+sudo apt install -y python3 python3-pip
+pip3 install --upgrade pip
+pip3 install numpy cmake_format==0.6.8
 ```
 
 Add the pip directory to your PATH: