vsftpd improvements:
- intorduce one declarative list of options
- make docummentation strings more understandable and add missing options
such as SSL/TLS support
- Use environment.etc."vsftpd".text because I can't think about any
reason why a shell script should be used.
That code was written in 2009.
It's now "<yy>.<mm>pre<commit-count>.<short-hash>"
(e.g. "13.10pre5678.gfedcba") for the unstable branch, and
"<yy>.<mm>.<commit-count>.<short-hash>" (e.g. "13.10.5678.gfedcba")
for stable branches.
