Alex Richardson 6f30d1c851 ng_macfilter_test: Skip rather than fail if there is no network
This should bring the number of Jenkins failures from 4 down to 3.
Locally kyua now prints `skipped: could not find a valid interface  [0.115s]`
when I run it in QEMU without a network device.

Reviewed By:	lwhsu
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D29414
2021-03-25 11:16:12 +00:00
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