SSH2: make it so you can verify server public host key without logging on
SSH2: add unit test for getServerPublicHostKey
SSH2: rm redundant part of SSH2 unit test
Merge pull request #380 from terrafrost/server-host-key

SSH2: make it so you can verify server public host key without logging on

* terrafrost/server-host-key:
  SSH2: rm redundant part of SSH2 unit test
  SSH2: add unit test for getServerPublicHostKey
  SSH2: make it so you can verify server public host key without logging on