daemon: test restarting.

We add a "dev-restart" command which causes the daemon to close fds
and exec itself.  Then we do it after every command, with the caveat
that we always send a commit before newhtlc, because if not committed,
that is forgotten.  Fulfillhtlc and failhtlc get resent, since they're
idempotent.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/controlled_time.h

@@ -2,8 +2,11 @@
 #define LIGHTNING_DAEMON_CONTROLLED_TIME_H
 #include "config.h"
 #include <ccan/short_types/short_types.h>
+#include <ccan/tal/tal.h>
 #include <ccan/time/time.h>
 
 struct timeabs controlled_time(void);
+void controlled_time_register_opts(void);
+char *controlled_time_arg(const tal_t *ctx);
 
 #endif /* LIGHTNING_DAEMON_CONTROLLED_TIME_H */