Cleanup of server reading code, preparation, for dynamic reading from files.

src/dnsmasq.h

@@ -1153,6 +1153,13 @@ int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp);
 int random_sock(int family);
 void pre_allocate_sfds(void);
 int reload_servers(char *fname);
+void mark_servers(int flag);
+void cleanup_servers(void);
+void add_update_server(int flags,
+		       union mysockaddr *addr,
+		       union mysockaddr *source_addr,
+		       const char *interface,
+		       const char *domain);
 void check_servers(void);
 int enumerate_interfaces(int reset);
 void create_wildcard_listeners(void);