Feature Request

Spin off from #207

Native client join requires that consume_output=True be set in order to get exit codes.

The following returns a None exit code:

output = client.run_command('pwd',return_list=True)
client.join(output, consume_output=True)
for host_output in output:
    exitcode = host_output.exit_code
    print(exitcode)
None

Works with consume output:

output = client.run_command('pwd',return_list=True)
client.join(output, consume_output=True)
for host_output in output:
    exitcode = host_output.exit_code
    print(exitcode)
0

By buffering all output automatically in pssh.clients.native.single.SSHClient we can ensure all available output is automatically consumed and make the API simpler to use.

This should be able to get exit code:

output = client.run_command('pwd', return_list=True)
client.join(output)
for host_output in output:
    exitcode = host_output.exit_code
    print(exitcode)

• Consume output from channel automatically in pssh.clients.native.single.SSHClient by buffering all available output in python side code. This also makes parallel-ssh API consistent regardless of underlying SSH library implementation (libssh/libssh2).