Huawei smartax ssh autodetect

[evilmonkey19]

Adding support for Huawei SmartAX. The \n is important because by default this device has a smart mode completion. This way the final output would be like this:

OLT>display system sys-info 
{ <cr>||<K> }: 

  Command:
          display system sys-info
  --------------------------------------------------
  The main service identification of this node:
    1

  The IP address of this node:
    1.1.1.1

  The description of this node:
    Huawei Integrated Access Software
  --------------------------------------------------

[ktbyers]

I separated only the SSH autodetect changes in this PR:

#3574