image_builder: install lxml w apt

pymavlink required lxml
can't install w pip https://stackoverflow.com/questions/33064433/lxml-will-never-finish-building-on-ubuntu

builder/assets/kinetic-rosdep-clever.yaml

@@ -79,6 +79,9 @@ image_transport:
 libmavconn:
   debian:
     stretch: [ros-kinetic-libmavconn]
+lxml:
+  debian:
+    stretch: [python-lxml=3.7.1-1]
 mavlink:
   debian:
     stretch: [ros-kinetic-mavlink]

builder/image-ros.sh

@@ -134,11 +134,10 @@ echo_stamp "Installing CLEVER" \
 && git clone ${REPO} /home/pi/catkin_ws/src/clever \
 && cd /home/pi/catkin_ws/src/clever \
 && git checkout ${REF} \
-&& pip install wheel \
-&& pip install -r /home/pi/catkin_ws/src/clever/clever/requirements.txt \
 && cd /home/pi/catkin_ws \
 && resolve_rosdep $(pwd) \
-&& ls -l /opt/ros/kinetic \
+&& pip install wheel \
+&& pip install -r /home/pi/catkin_ws/src/clever/clever/requirements.txt \
 && source /opt/ros/kinetic/setup.bash \
 && catkin_make -j${NUMBER_THREADS} -DCMAKE_BUILD_TYPE=Release \
 && ln -s /root/roscore.service /lib/systemd/system/roscore.service \

builder/image-software.sh

@@ -78,9 +78,6 @@ python-wstool=0.1.17-1 \
 python-rosinstall=0.7.8-1 \
 build-essential=12.3 \
 mjpg-streamer=2.0 \
-python-dev \
-libxml2-dev=2.9.4+dfsg1-2.2+deb9u2 \
-libxslt1-dev=1.1.29-2.1 \
 > /dev/null \
 && echo_stamp "Everything was installed!" "SUCCESS" \
 || (echo_stamp "Some packages wasn't installed!" "ERROR"; exit 1)