Major update to stretch and many improvements
Improvements: * Update to debian stretch * Fix Dockerfile style * Add FTP UID/GID Docker build args * Add run-ssl to Makefile for testing SSL config * Fix scripts style * Fix scripts issues reported by shellcheck * Add FTP_CHOWN_ROOT function to chown /srv in the container * Add allow_writeable_chroot=YES to vsftpd_ssl.conf to match vsftpd.conf * Update README.md
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