Change default blockpoll to 5s, assuming the notifier will be used with bitcoind

ckpool.conf

@@ -13,7 +13,7 @@
 ],
 "btcaddress" : "14BMjogz69qe8hk9thyzbmR5pg34mVKB1e",
 "btcsig" : "/mined by ck/",
-"blockpoll" : 50,
+"blockpoll" : 5000,
 "update_interval" : 30,
 "serverurl" : "ckpool.org:3333",
 "mindiff" : 1,

src/ckpool.c

@@ -1207,8 +1207,10 @@ int main(int argc, char **argv)
 	ckp.donaddress = "14BMjogz69qe8hk9thyzbmR5pg34mVKB1e";
 	if (!ckp.btcaddress)
 		ckp.btcaddress = ckp.donaddress;
+	/* Default blockpoll is sanity check only when notifier is not used or
+	 * fails */
 	if (!ckp.blockpoll)
-		ckp.blockpoll = 50;
+		ckp.blockpoll = 5000;
 	if (!ckp.update_interval)
 		ckp.update_interval = 30;
 	if (!ckp.mindiff)