Release version 1.7.0

Release 1.6.0

- Refactored and reduced size of all images (on-demand installation, removed not needed packages, improved ENVs/LABELs to reduce numbers of layers)
- Cleanup images
- Add new on-demand installation and provisioning of services (eg. postfix, ssh...)
- Improved python console handling and output, also fixes dependency detection
- Renamed alpine-3 to alpine (symlink to keep backward compatibility)
- Add webdevops/php-official and also to webdevops/php and other images
- Introduce docker-image-info for gathering information about current used image (family, distribution, version ...)
- Introduce docker-service enable and docker-service disable to enable and disable services (eg. postfix, ssh ...)
- Fix supervisord message about passwordless http server (unix socket)
- Fix and improve tests (eg. in ipv6 environments)
- Add go-replace to replace sed/awk stuff
- Add webdevops/liquisoap
- Add LOG_STDOUT and LOG_STDERR (redirect docker output, also possible to prevent output using /dev/null)
- Set nginx log level to warn in production and info in nginx-dev images
- Move ansible to webdevops/base