Bug#874373: RFS: vnstat/1.17-1+nmu1 ITA

[Christian Göttsche <cgzones@googlemail.com>]

I uploaded a new package version in which the not upstreamed patches
are dropped, the maintainer is set to myself and the vcs fields are
updated accordingly.
With #874387 Felix is searching for a new maintainer for this package;
what are the requirements for me to become such?

Also, I like to ask a technical question:
What is the common dealing with state file upon package purge?
Vnstat saves the network statistics under /var/lib/vnstat and as this
folder is listed in debian/vnstat.install, dpkg warns upon purge
operation that this directory cannot be deleted, because it is not
empty.
Should the directory be emptied in the postrm script or is this
warning acceptable?