Error if Host and HostName don't match in ssh_config

[fossil12]

Steps to reproduce

1. Add a Host entry in your ssh_config:

Host your-server
    HostName 10.0.2.4

2. Run the following code:

hosts = ['your-server']
client = ParallelSSHClient(hosts)
client.run_command('ls')

Expected result

The command is executed on "your-server" at 10.0.2.4 like in the first usage example.

Actual result

A KeyError: '10.0.2.4' is raised.

Traceback (most recent call last):
  File "./test.py", line 11, in <module>
    output = client.run_command('ls')
  File "pssh/pssh_client.py", line 689, in run_command
    self.get_output(cmd, output, encoding=encoding)
  File "pssh/pssh_client.py", line 778, in get_output
    stdout = self.host_clients[host].read_output_buffer(
KeyError: '10.0.2.4'

My research showed that this is due to the fact that ParallelSSHClient stores the SSHClient at key your-server, but the hostname returned by SSHClient is 10.0.2.4.

I'm not so sure how to fix this, thus I'm filing it here.

[pkittenis]

Thanks for the report and the reproducible test.