Field mode enable keyword

Changes:
   - Move existing test to code update library keyword.
   - Rename existing test name and call the new keyword.
   - Enable field mode in setup sequence__init__.robot for CT.

Resolves  openbmc/openbmc-test-automation#1133

Change-Id: Ida405818fb0c474247aa664bceab461d5b7b61ae
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
3 files changed