Copy a local file to the given remote path.

def scp(self, local_file, remote_path=''):
        """Copy a local file to the given remote path."""
        if self.args.user:
            upload_spec = '{0}@{1}:{2}'.format(self.args.user,
                                               self.args.server,
                                               remote_path)
        else:
            upload_spec = '{0}:{1}'.format(self.args.server, remote_path)

        return self.sh('scp', local_file, upload_spec)