PNOR update enhancement

Changes address the following:
  - Documentation updates
  - Few minor alignment fix
  - Renaming keyword name
  - Added parameter validation
  - Update logic to wait for BMC standby

Resolves openbmc/openbmc-test-automation#239

Change-Id: Ib0f9a4681ebee952284c37caebcee8fff22db061
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
1 file changed