Opens a SSHSession channel and connects a ProcessProtocol to it

    @param connection: the SSH Connection to open the session channel on
    @param processProtocol: the ProcessProtocol instance to connect to the process
    @param commandLine: the command line to execute the process
    @param env: optional environment variables to set for the process
    @param usePTY: if set, request a PTY for the process
    @param childFDs: custom child file descriptors for the process

def connectProcess(connection, processProtocol, commandLine='', env={},
                   usePTY=None, childFDs=None, *args, **kwargs):
    """Opens a SSHSession channel and connects a ProcessProtocol to it

    @param connection: the SSH Connection to open the session channel on
    @param processProtocol: the ProcessProtocol instance to connect to the process
    @param commandLine: the command line to execute the process
    @param env: optional environment variables to set for the process
    @param usePTY: if set, request a PTY for the process
    @param childFDs: custom child file descriptors for the process
    """
    processOpenDeferred = defer.Deferred()
    process = SSHProcess(processProtocol, commandLine, env, usePTY, childFDs,
                         *args, **kwargs)
    process.processOpen = processOpenDeferred.callback
    process.openFailed = processOpenDeferred.errback

    connection.openChannel(process)
    return processOpenDeferred