psql: Change new \conninfo to use SSL instead of TLS

Commit bba2fbc623 introduced a new implementation of the \conninfo
command in psql.  That new code uses the term "TLS" while the rest of
PostgreSQL, including the rest of psql, consistently uses "SSL".  This
is uselessly confusing.  This changes the new code to use "SSL" as
well.

Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://www.postgresql.org/message-id/f4ff9294-b491-4053-83f5-11c10ab8c999@eisentraut.org

doc/src/sgml/ref/psql-ref.sgml

@@ -1101,7 +1101,7 @@ SELECT $1 \parse stmt1
         <listitem>
          <para>
           Outputs information about the current database connection,
-          including TLS-related information if TLS is in use.
+          including SSL-related information if SSL is in use.
          </para>
          <para>
           Note that the <structfield>Client User</structfield> field shows

src/bin/psql/command.c

@@ -877,11 +877,11 @@ exec_command_conninfo(PsqlScanState scan_state, bool active_branch)
 	printTableAddCell(&cont, _("Backend PID"), false, false);
 	printTableAddCell(&cont, backend_pid, false, false);
 
-	/* TLS Connection */
-	printTableAddCell(&cont, _("TLS Connection"), false, false);
+	/* SSL Connection */
+	printTableAddCell(&cont, _("SSL Connection"), false, false);
 	printTableAddCell(&cont, ssl_in_use ? _("true") : _("false"), false, false);
 
-	/* TLS Information */
+	/* SSL Information */
 	if (ssl_in_use)
 	{
 		char	   *library,
@@ -898,19 +898,19 @@ exec_command_conninfo(PsqlScanState scan_state, bool active_branch)
 		compression = (char *) PQsslAttribute(pset.db, "compression");
 		alpn = (char *) PQsslAttribute(pset.db, "alpn");
 
-		printTableAddCell(&cont, _("TLS Library"), false, false);
+		printTableAddCell(&cont, _("SSL Library"), false, false);
 		printTableAddCell(&cont, library ? library : _("unknown"), false, false);
 
-		printTableAddCell(&cont, _("TLS Protocol"), false, false);
+		printTableAddCell(&cont, _("SSL Protocol"), false, false);
 		printTableAddCell(&cont, protocol ? protocol : _("unknown"), false, false);
 
-		printTableAddCell(&cont, _("TLS Key Bits"), false, false);
+		printTableAddCell(&cont, _("SSL Key Bits"), false, false);
 		printTableAddCell(&cont, key_bits ? key_bits : _("unknown"), false, false);
 
-		printTableAddCell(&cont, _("TLS Cipher"), false, false);
+		printTableAddCell(&cont, _("SSL Cipher"), false, false);
 		printTableAddCell(&cont, cipher ? cipher : _("unknown"), false, false);
 
-		printTableAddCell(&cont, _("TLS Compression"), false, false);
+		printTableAddCell(&cont, _("SSL Compression"), false, false);
 		printTableAddCell(&cont, (compression && strcmp(compression, "off") != 0) ?
 						  _("true") : _("false"), false, false);