bmc/buildjson: Allow for systemd verification services
bmc/buildjson: Allow for systemd verification services

Now that we can inspect the status of systemd units, this is a perfectly
valid configuration.

Tested:
    Modified scripting to use systemd type services in place of their
    fileSystem variants and their status was correctly reported through
    the verification and update phases.

Change-Id: I46ab0da1f71a1098d49de9feb24d7e26c1c4bf68
Signed-off-by: William A. Kennington III <30fff5198f4d10ca1117e5f3ec82f3b4b8900d81@google.com>

openbmc/phosphor-ipmi-flash