supervisord is in epel repositories on centos

Added sym-link to docker-compose singlenode file by default to make life easier 

Moved docker-compose singlenode file to the repo root
removed docker build script as it is not really needed
Enabled Java setup flag which was missing for docker

7.10.3+ only

mysql 5.6 is not supported on buster

Since documents is still not merged / installable i removed it from the default setup. Feel free to try it later on manually by adding the repos.

Missed some distribution check

Relatime packages got removed

Configurable via config/config (type and version)

The create context gets its config now from config/environment out of a seperate context config file and a seperate users.csv file. Take a look at the default ‘qa’ environment in order to adapt your own …

Re-added retry logic from qa/installer to prevent failed setups due to updated buildservice repositories while installer is preparing

in preperation for mariadb, now with configurable mysql version support (works on Debian 9/10, CentOS6/7)

Missed some restart for the documentconverter to be functional after the initial setup. A seperate restart was required prior to this fix.

SSL now works on CentOS/RHEL

# Conflicts:
#	config/config
#	config/init-documents-collaboration.sh
#	setup/install-java.sh

Singlenode docker image now includes OX Core, Guard, Documents (withs collaboration server) and the Document converter