lightning-cli: print notifications (with '# ' prefix) if received.

This can be suppressed with -N.

Note that we wull get an error with older lightningd, but we ignore it
anyway.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: cli: print notifications and progress bars if commands provide them.

cli/Makefile

@@ -10,6 +10,7 @@ LIGHTNING_CLI_COMMON_OBJS :=			\
 	common/configdir.o			\
 	common/json.o				\
 	common/json_stream.o			\
+	common/status_levels.o			\
 	common/utils.o				\
 	common/version.o