Fix for cpu inventory path for Get_a_Property test case

Why the test case failing:
   - The URL for CPU is not same for Barreleye and Palmetto.

This fix includes:
   - Enumerates the inventory to find cpu URL path
   - Removed this test from skip list
   - Added keywork in utils.robot to get url paths ending
     particular string

Resolves openbmc/openbmc-test-automation#208

Change-Id: I59c1969ad01a6aee88af99aa7ccc7a46359584f1
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
3 files changed