Installation of runer problems

[xtrojak]

The automatic installation process of runner has several minor issues:

• DB access outside of local host could be resolved automatically (just minor modification in /etc/mysql/mariadb.conf.d/50-server.cnf for Neurons)
• running redeploy for the first time sometimes causes error docker: Error response from daemon
• line usermod -aG docker bioarineo in install_docker.sh rises usermod: not found
• after installing docker, the device must be rebooted (acts like the docker is not installed properly, after reboot everything is fine)