message: Update sovrin-pool.dockerfile
  Fix evernym keys.
diff: @@ -18,8 +18,8 @@ RUN pip3 install -U \
  pip \
  setuptools
  -RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EAA542E8
  -RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D82D8E35
  +RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 68DB5E88
  +RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BD33704C
  RUN echo "deb https://repo.evernym.com/deb xenial master" >> /etc/apt/sources.list
  RUN echo "deb https://repo.sovrin.org/deb xenial master" >> /etc/apt/sources.list
  