Ubuntus: Add python3-pytest to installed packages

dockerfiles/bionic.docker

@@ -35,6 +35,7 @@ RUN apt-get update && \
     apt-get install -y netcat-openbsd && \
     apt-get install -y libarmadillo-dev && \
     apt-get install -y libjsoncpp-dev && \
+    apt-get install -y python3-pytest && \
     useradd -u 30996 msk_jenkins && \
     ln -sfn /usr/lib/x86_64-linux-gnu/libzmq.so.5 /usr/lib/x86_64-linux-gnu/libzmq.so.3 && \
     pip3 install meson

dockerfiles/xenial.docker

@@ -36,6 +36,7 @@ RUN apt-get update && \
     apt-get install -y netcat-openbsd && \
     apt-get install -y libarmadillo-dev && \
     apt-get install -y libjsoncpp-dev && \
+    apt-get install -y python3-pytest && \
     useradd -u 30996 msk_jenkins && \
     ln -sfn /usr/lib/x86_64-linux-gnu/libzmq.so.5 /usr/lib/x86_64-linux-gnu/libzmq.so.3 && \
     pip3 install pip --upgrade && \