Import ITS#4401 fix from HEAD

CHANGES

@@ -8,6 +8,7 @@ OpenLDAP 2.3.20 Engineering
 	Fixed slapd context CSN not updating issue (ITS#4384)
 	Fixed slapd non-read/write epoll event handling (ITS#4395)
 	Fixed slapd syncrepl de-normalize UUID issue
+	Fixed slapd syncrepl dynamic reconfig issue (ITS#4401)
 	Added slapd syncrepl log messages (ITS#4369)
 	Added slapd permissive modify/increment support
 	Fixed slapd connectionless LDAP support

servers/slapd/syncrepl.c

@@ -2582,6 +2582,16 @@ avl_ber_bvfree( void *v_bv )
 void
 syncinfo_free( syncinfo_t *sie )
 {
+ 	if ( sie->si_ld ) {
+ 		if ( sie->si_conn_setup ) {
+ 			ber_socket_t s;
+ 			ldap_get_option( sie->si_ld, LDAP_OPT_DESC, &s );
+ 			connection_client_stop( s );
+ 			sie->si_conn_setup = 0;
+ 		}
+ 		ldap_unbind_ext( sie->si_ld, NULL, NULL );
+ 	}
+
  	ldap_pvt_thread_mutex_destroy( &sie->si_mutex );
 
 	bindconf_free( &sie->si_bindconf );
@@ -2637,9 +2647,6 @@ syncinfo_free( syncinfo_t *sie )
 	if ( sie->si_presentlist ) {
 	    avl_free( sie->si_presentlist, avl_ber_bvfree );
 	}
-	if ( sie->si_ld ) {
-		ldap_unbind_ext( sie->si_ld, NULL, NULL );
-	}
 	while ( !LDAP_LIST_EMPTY( &sie->si_nonpresentlist )) {
 		struct nonpresent_entry* npe;
 		npe = LDAP_LIST_FIRST( &sie->si_nonpresentlist );