daemon/test: activate segwit.

You need to be running a bitcoind modified with segregated witness:

	https://github.com/sipa/bitcoin/tree/segwit4

It needs 432 blocks to activate it!

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

test-cli/scripts/generate-block.sh

@@ -8,7 +8,14 @@ INIT=$1
 
 # Initially we need 100 blocks so coinbase matures, giving us funds.
 if [ -n "$INIT" ]; then
-    $CLI generate 101
+    # To activate segwit via BIP9, we need at least 432 blocks!
+    $CLI generate 432
+    if $CLI getblockchaininfo | tr -s '\012\011 ' ' ' | grep -q '{ "id": "witness", "status": "active" }'; then :
+    else
+	echo "Segwit not activated after 432 blocks?" >&2
+	$CLI getblockchaininfo >&2
+	exit 1
+    fi
 else
     $CLI generate 1
 fi