bluval engine refactoring

actual .robot testcases used instead of helloworld
bluval-dummy.yaml is added for dummy blue print to test easily
All the rebot results redirected to one directory results
click is used to take parameters from CLI
optional --layer/l is taken as parameter
Deriving yaml location from blue print name
Sections named as layers and layer names expanded hw -> hardware
.py code refactored, mode functions added.

Change-Id: Id916a79301d32ed64afc398fb486ba71b81a1dea
Signed-off-by: Naga Sugguna <ns156u@att.com>