Return the maximum privilege in open session command

This commit does the following:

- Set the maximum privilege role in the session instead of current privilege
  in the implementation of the open session request/response.

- In open session response, return the maximum privilege of the session
  instead of the current privilege level.

- Update RAKP12 and RAKP34 implementation

Tested: Checked the session setup works fine with ipmitool and freeipmi
utility ipmipower.

Change-Id: I41b63b91f08c2ed96856c4db41eedaa878c663e3
Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
5 files changed