use docker-compose from pypi with support for 2.1 compose file version
logstash, kibana, head & netdata are now depending on a healthy elasticsearch container before starting
remove alerta-cli
tweak installer
lift resolution constraints (keep autodetect from kernel fb)
thanks to @sunshine112 reporting issue #62 - the reason why the install fails is due to the fact that the latest kernel is very picky about a clean unmount of the used block device. the block device will now be unmounted cleanly as soon as the write operation of the ISO Maker is finished writing the image to the USB drive.
T-Pot ISO Creator will now create images based on the Ubuntu Network Installer (mini.iso). This results in a greatly reduced size for the T-Pot Installer with now being just about 49MB. T-Pot was only using the base install packages of the 700MB Ubuntu Server ISO and still had to download the latest packages anyway. The advantages are a) reduced download size for the Ubuntu Network Installer instead of the full image, b) the latest packages are already installed during the base installation and c) the resulting T-Pot ISO can be distributed easier.