Update fan test verification

On Barreleye system, the current device driver doesn't expose
the controller's "Target" and it is intended to remain that way.

To make the test code verification compatible on all the supported
systems, the missing "Target" property is ignored if not found on
the system under test.

Resolves openbmc/openbmc-test-automation#615

Change-Id: I5e53c206dad5611c81f9f302ca6842c354f1e0a0
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
1 file changed