Redo the code for installing tls/sasl transport streams.

* include/mailutils/stream.h (MU_IOCTL_SWAP_STREAM): Remove.
(MU_IOCTL_GET_STREAM, MU_IOCTL_SET_STREAM): New ioctls.
* include/mailutils/sys/stream.h (_MU_SWAP_FIRST_ONLY)
(_MU_SWAP_IOCTL_MUST_SUCCEED): Remove.
(_mu_stream_swap_streams): Remove.
* libmailutils/stream.c (_mu_stream_swap_streams): Remove.

* libmailutils/filter_iconv.c (_icvt_ioctl): Handle MU_IOCTL_GET_STREAM,
MU_IOCTL_SET_STREAM instead of MU_IOCTL_SWAP_STREAM.
* libmailutils/iostream.c (_iostream_ctl): Likewise.
* libmailutils/xscript-stream.c (_xscript_ctl): Likewise.

* imap4d/auth_gsasl.c (restore_and_return): Unref the contents of str.
(auth_gsasl): Use MU_IOCTL_GET_STREAM/MU_IOCTL_SET_STREAM to
change the underlying transport streams.
* imap4d/io.c (imap4d_init_tls_server): Likewise.
* libproto/mailer/smtp_gsasl.c (insert_gsasl_stream): Likewise.
* pop3d/extra.c (pop3d_init_tls_server): Likewise.

* libproto/mailer/smtp_starttls.c (smtp_get_streams)
(smtp_set_streams): New functions.
(smtp_swap_streams): Remove.
(mu_smtp_starttls): Use smtp_get_streams and smtp_set_streams
instead of smtp_swap_streams.
* libproto/pop/pop3_stls.c (pop3_get_streams)
(pop3_set_streams): New functions.
(pop3_swap_streams): Remove.
(mu_pop3_stls): Use pop3_get_streams and pop3_set_streams.

* testsuite/smtpsend.c (main): Uncomment mu_stream_unref on
the carrier.

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