Loosen AppleDouble checks for DragonflyBSD and OpenBSD #456

Job	Run time
Build Netatalk container	1m 4s
Build Netatalk testsuite container	1m 11s
Netatalk container dry run	9s
AFP spec test - AFP 3.2	1m 6s
AFP spec test - AFP 3.3	1m 10s
AFP spec test - AFP 2.2	57s
AFP spec test (Readonly) - AFP 2.1	10s
AFP spec test - AFP 2.1	1m 1s
AFP spec test - AFP 3.0	1m 10s
AFP spec test - AFP 3.1	1m 7s
AFP spec test - AFP 3.4	1m 8s
AFP login test - AFP 2.1	11s
AFP login test - AFP 3.4	9s
AFP spec test (Readonly) - AFP 3.4	10s
	10m 43s

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