Fix errors in IPMI server
Fix errors in IPMI server

If a client used a non-zero IPMI sequence
number, honor the number and separate it
from the LUN.  Also, start session sequence
number at 1 when session is established.

Change-Id: Ife4a03965185160b31e5ca70d455db0e301c4d6f

openstack/pyghmi,stackforge/pyghmi,openstack/pyghmi