Update devcontainers

- setuptools support
- pre-compile PyBitmessage

.devcontainer/Dockerfile

@@ -15,6 +15,9 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get install -y \
     libcap-dev \
     libssl-dev \
     pylint \
+    python-setuptools \
+    python2.7 \
+    python2.7-dev \
     python3 \
     python3-dev \
     python3-flake8 \
@@ -26,9 +29,6 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get install -y \
 
 RUN apt-add-repository ppa:deadsnakes/ppa
 
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    python2.7 python2.7-dev
-
 RUN pip install 'tox<4' 'virtualenv<20.22.0'
 
 RUN groupadd --gid $USER_GID $USERNAME \

.devcontainer/devcontainer.json

@@ -16,6 +16,7 @@
     ],
     "dockerFile": "Dockerfile",
     "postCreateCommand": "pip3 install -r requirements.txt",
+    "updateContentCommand": "python2.7 setup.py install --user",
     "remoteEnv": {
         "PATH": "${containerEnv:PATH}:/home/user/.local/bin"
     },