test.sh: split into multiple scripts.

This significantly reduces re-testing of the same paths, and simplifies
the addition of new tests.

make check -j12 times:
	Before: 9m24.973s
	After:	7m52.005s

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

daemon/test/scripts/helpers.sh

@@ -148,6 +148,7 @@ start_lightningd()
 
     # If bitcoind not already running, start it.
     if ! $CLI getinfo >/dev/null 2>&1; then
+	echo Starting bitcoind...
 	scripts/setup.sh
 	SHUTDOWN_BITCOIN=scripts/shutdown.sh
     else