message: fixed docker develop image python3.6
diff: @@ -14,7 +14,7 @@ RUN apt-get update && \
  # add repos
  RUN set -e; \
  add-apt-repository -y ppa:ubuntu-toolchain-r/test; \
  - wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -; \
  + wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1 apt-key add -; \
  echo 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-6.0 main' >> /etc/apt/sources.list; \
  echo 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-7 main' >> /etc/apt/sources.list; \
  apt-get update
  @@ -28,7 +28,7 @@ RUN set -e; \
  # Pythons
  python-pip python3-pip python3-setuptools python-dev \
  # other
  - curl file gdb gdbserver ccache \
  + curl file gdb gdbserver ccache python3.6-dev \
  gcovr cppcheck doxygen rsync graphviz graphviz-dev unzip vim zip pkg-config; \
  apt-get -y clean
  @@ -75,11 +75,6 @@ RUN set -e; \
  apt-get -y install openjdk-8-jre; \
  java -version
  -RUN set -e; \
  - add-apt-repository -y ppa:jonathonf/python-3.6; \
  - apt-get update; \
  - apt-get -y install python3.6-dev
  -
  # python bindings dependencies
  RUN set -e; \
  pip install grpcio_tools pysha3; \
  