dftest: Fix command-line argument parsing

Expressions that start with hyphen clash with command-line options.
In that case we need to pass "--" to dftest to stop processing
options.

Fix the test suite to do this. Fixes failures with dftest and
expressions like:

    -2 == tcp.port

Replace the GLib option parser with getopt while at it. The GLib API
is nice but isn't a good fit for this utility and the code appears to
be inconsistent on whether "--" is left in the argv or not.

0 files changed, 0 insertions, 0 deletions