Initial import of pkgsurvey, a utility to feedback package usage

Initial import of pkgsurvey, a utility to feedback package usage
information, when run, to the NetBSD pkgsrc people.  There is a
possibility that you may not want to divulge this information - in
which case, you should consider deleting this package from your system
(to ensure that no-one can run it).  Information is only sent when
pkgsurvey is invoked.

The information gathered will not be divulged to anyone.  It will be
used for pkgsrc scheduling purposes.