Deleting the Test cases in test_sensors.robot.
Deleting the Test cases in test_sensors.robot.

These test cases are covered in the test_inventory.robot.

Resolves openbmc/openbmc-test-automation#854

Change-Id: I434e0c74da17839a25b8015031cb57030c4ad1ae
Signed-off-by: Sweta Potthuri <2dadfb5b6d383cf4af087a4abfaa582bcc4a300f@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation