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2021-06-24T12:01:37.945917Z
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tests/netgraph: Fix build error due to missing directory

While MFCing the tests into stable/11 the test directory needs to be
added, because earlier netgraph tests were not MFCed to this train.

PR:		256773
Reported by:	Arrigo Marchiori
Submitted by:	Arrigo Marchiori
Tested by:	Arrigo Marchiori

This is a direct commit into the stable/11 branch.

Git Hash:   db7136d6b97f53e58976d20b454f7bb71322b07d
Git Author: donner@FreeBSD.org
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