Fix flags parsing in Mac OS X 10.9

The bash shell shipped with OS X 10.9 is ancient (3.2) and needs making
OPTIND local before calling getopts for various getopts calls to work.
This fixes all broken tests.
Drop stale CVS tags

These were leftovers from the import of the CVS sources into git.
Generalize default.conf for use on other systems

Rename the existing default.conf file to NetBSD.conf, which is only
installed when using sysbuild on NetBSD hosts, and add a new default
configuration file that is valid for any OS.