Additional cleanup during mesh install

src/freedombone-image-customise

     install_web_server
     mesh_install_scuttlebot
     #install_ferment
+
+    chroot "$rootdir" apt-get clean
+    chroot "$rootdir" /bin/rm -rf /var/lib/apt/lists/*
+    chroot "$rootdir" apt-get clean
+
     install_ipfs
     install_tox
     install_pelican