Add privilege_level to remote management parameters

Add privilege_level to remote management parameters

This change proposes addition of a new optional parameter to
PDF schema to make setting different privilege level for remote
access possible via PDF.

In certain cases, the users of a specific POD may not be granted
ADMIN privileges to use remote management capabilities and instead
they may be granted lower privileges such as OPERATOR. Even though
this type of situations could be hanled in provisioning frameworks
and can perhaps be pushed into IDF, it is more appropriate to put
the privilege level setting into PDF next to other remote management
parameters.

Change-Id: I8486c0f8867d8dd54d1731876e0ffef33fb36a96
Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>