Add default value as localhost for the inventory
option of the validation.py cli script
Fix related CI issues that comes with this change:
* add block for only check sestatus when a stdout is defined
* add extra_vars to the validation.py script to be able
to configure the check-ram validation for CI envirnonment.
Change-Id: I2aaaa702d587b9ea5b79338c4b1dbf426e2b581d