This commit modifies the vtpm instance path to reflect
openstack-help default
The vtpm data will now be located under
/var/lib/nova/instances
Story: 2003909
Task: 27081
Change-Id: Ibb54558e2d84afae23c9094e631b904a68400e7e
Signed-off-by: Paul-Emile Element <Paul-Emile.Element@windriver.com>