Debian fixes

[clopez]

This pull request includes the fixes that I made until today to util-vserver while working on the Debian package available at git://git.debian.org/git/pkg-vserver/pkg-vserver.git

[dhozac]

Aside from the "bashisms" commit, this looks pretty mergeable. Any chance you could get rid of that? util-vserver is explicitly a bash-only project.

[clopez]

Then, why the headers of the files are #!/bin/sh instead of #!/bin/bash ????

If you want to target bash scripting, you should fix the shebang.

[glensc]

@dhozac imho you can merge this and just reseting last commit out (last commit is what you don't like)