Couple of fixes - quite important

After couple of tests I found some issues and had to resolve those:

1. Forgot about pwdgen binary
2. In the sshd there was a typo in shebang, so supervisord was not starting sshd properly
3. Also there are couple updates in documentation and configs

Yet still there is no config files export. I'm not sure how to solve this. In current form this Bind server works fine as a cache'ing & resolving DNS and that's enough for most of situations.

Maybe we could create 2 subdirs in "Bind"; one would include only cache'ing & resolving DNS server without any external storage and the second one with external storage for config files?

Moreover I thought about logfiles. Those are quite important imo. Maybe we should export those to external storage... in that case those two subdirs way has no point :)

What're your thoughts on this?