pop3d: implement TLS in inetd mode

New global configuration statement "tls-mode" configures the TLS for
use in inetd mode.

The certificate and key files are configured by the global "tls"
compound statement.

Example configuration (pop3s server):

  mode inetd;
  tls-mode connection;
  tls {
      ssl-key-file /etc/ssl/key.pem;
      ssl-certificate-file /etc/ssl/cert.pem;
  }

In daemon mode, global "tls-mode" sets the type of TLS encryption to
use in all server blocks that lack the "tls-mode" statement.

* pop3d/cmd.c (global_tls_mode)
(global_conf_status): New globals.
(stls_server_check): New function.
(stls_preflight): Use stls_server_check.
* pop3d/pop3d.c (pop3d_cfg_param): New global statement: tls-mode
(main): Set up TLS connection in inetd mode, if requested.
* pop3d/pop3d.h (global_tls_mode): New global.
(stls_server_check): New proto.

* NEWS: Document changes.
* doc/texinfo/programs/pop3d.texi: Likewise.

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