arpwatch: create per-interface systemd activation units
arpwatch systemd activation snippets now take a "arpwatch@INTERFACE" syntax. (bnc#853384).
This moves the ARPWATCH_INTERFACE meaning from the /etc/sysconfig/arpwatch configuration
file to explicit activation via systemd.
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Submitted by
Robert Milasan (rmilasan)
Fixed bugs
bnc#853384
arpwatch: systemd ignores settings in /etc/sysconfig/arpwatch
