macipgw: Unprivileged user feature and Linux arp fix #157

Job	Run time
Build Netatalk container	49s
Build Netatalk testsuite container	1m 0s
Netatalk container dry run	5s
AFP spec test - AFP 3.4	1m 6s
AFP spec test - AFP 3.3	1m 8s
AFP login test - AFP 2.1	6s
AFP spec test (Readonly) - AFP 3.4	8s
AFP spec test (Readonly) - AFP 2.1	7s
AFP login test - AFP 3.4	6s
AFP spec test - AFP 2.1	55s
AFP spec test - AFP 2.2	59s
AFP spec test - AFP 3.0	1m 6s
AFP spec test - AFP 3.1	1m 6s
AFP spec test - AFP 3.2	1m 8s
	9m 49s

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