Minor fix on data retrieve from 'dsmdf' command.

        else:

            exitCode = stdout.channel.recv_exit_status()

            if not exitCode:

                result = stdout.readlines()[0].rstrip('\n')

                self.HSMFilesystemList = result.splitlines()

                self.HSMFilesystemList = [ el.rstrip('\n') for el in stdout.readlines() ]

                return self.HSMFilesystemList.copy()

            else:

                raise TapeClientException(cmd, exitCode, stderr)

    def getHSMFilesystemFreeSpace(self, HSMFilesystem):

        "Returns the free space in bytes for a given HSM filesystem."

        """Returns the free space in bytes for a given HSM filesystem."""

        cmd = f"{self.DSMDF} -detail {HSMFilesystem} | grep \"Free Size\" | awk '{{ print $3 }}'"

        try:

            stdin, stdout, stderr = self.client.exec_command(cmd)