This change modifies the SSH and sysctl configurations to comply
with Akraino requirements. Among the changes:
o Zeroize kernel pointer values in logs
o Allow only members of the 'cloudadmin' group to log in via SSH
o Limit active SSH sessions to 2 per user
o Configure USBGuard with a rudimentary set of permissions
Signed-off-by: dave kormann <davek@research.att.com>
Change-Id: If52aa278b502f487091ed864b8e82acc7ff8f732