Fix salt-ssh highstate rendering

This patch addresses an issue where the ssh wrapper functions introduced a 'local' dictionary key to (probably) compensate for how the thin client used to render results. This extra 'local' key breaks the --out highstate rendering of salt-ssh as illustrated below.

```
[DEBUG   ] Traceback (most recent call last):
  File "/Users/stephanbuys/Documents/Coding/github/salt/salt/output/__init__.py", line 36, in display_output
    display_data = get_printout(out, opts)(data).rstrip()
  File "/Users/stephanbuys/Documents/Coding/github/salt/salt/output/highstate.py", line 67, in output
    return _format_host(host, hostdata)[0]
  File "/Users/stephanbuys/Documents/Coding/github/salt/salt/output/highstate.py", line 107, in _format_host
    rcounts.setdefault(ret['result'], 0)
KeyError: 'result'
```