Support privilege based lookup with user name

Support for privilege based lookup, with user name is added.
Still NULL user name is not supported for user/privilege based
lookup for security reasons

Unit-Test:
Verified ipmitool session with -L <privielge>+ and also verified
that RAKP12 fails, when requested privilege is more than the user
privilege.
ipmitool -I lanplus -H xx.xx.xx.xx -U root -P 0penBmc -L Administrator+
raw 6 1

Change-Id: Ia97d4f3091c5ca7e3b688188ce1690c17fce9891
Signed-off-by: Richard Marian Thomaiyar <richard.marian.thomaiyar@linux.intel.com>
2 files changed