pmacct update / bugfix?

Hello ports@,

I started playing w/ pflow and pmacct in a -current amd64 VM, and noticed a
few things:
- (bug) Time-based format strings in "print_output_file" always seem to
print the UNIX epoch.
- The default flavor isn't compiled w/ Jansson so cannot emit JSON output.
- The project has released 1.7.0 (with features I don't personally care
about).

Apologies that I haven't looked into the time bug, or tried to see if 1.7.0
fixes it.

Thanks.

--david

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