Commit fixes issue in 'user priv' sub-command which turns off LinkAuth whenever
user's privilege is changed. This was caused by not setting apropriate bits.
However, fix leverages Set User Access Command(IPMI spec. v2 PDF, p.320) and
sets 7th bit of 1st byte to 0. This tells BMC not to change IPMI messaging,
LinkAuth and Callback for given user.
As a consequence, ipmitool no longer turns 'IPMI messaging' on by default when
user's privilege is being set. IPMI messaging can be turned on/off via 'channel
setaccess' sub-command.
Reported-by: Kipp Glover