add a config file to test just one shard

Signed-off-by: Leo Chen <leo@harmony.one>

test/configs/local_config2.txt

@@ -1,12 +0,0 @@
-127.0.0.1 9000 leader 0
-127.0.0.1 9001 validator 0
-127.0.0.1 9002 validator 0
-127.0.0.1 9003 validator 0
-127.0.0.1 9004 validator 0
-127.0.0.1 9006 newnode 0
-127.0.0.1 9007 newnode 0
-127.0.0.1 9008 newnode 0
-127.0.0.1 9009 newnode 0
-127.0.0.1 9010 newnode 0
-127.0.0.1 9011 newnode 0
-127.0.0.1 19999 client 0

test/configs/oneshard.txt

@@ -0,0 +1,32 @@
+127.0.0.1 9000 leader 0
+127.0.0.1 9001 validator 0
+127.0.0.1 9002 validator 0
+127.0.0.1 9003 validator 0
+127.0.0.1 9004 validator 0
+127.0.0.1 9005 validator 0
+127.0.0.1 9006 validator 0
+127.0.0.1 9007 validator 0
+127.0.0.1 9008 validator 0
+127.0.0.1 9009 validator 0
+127.0.0.1 9010 validator 0
+127.0.0.1 9011 validator 0
+127.0.0.1 9012 validator 0
+127.0.0.1 9013 validator 0
+127.0.0.1 9014 validator 0
+127.0.0.1 9015 validator 0
+127.0.0.1 9016 validator 0
+127.0.0.1 9017 validator 0
+127.0.0.1 9018 validator 0
+127.0.0.1 9019 validator 0
+127.0.0.1 9020 validator 0
+127.0.0.1 9021 validator 0
+127.0.0.1 9022 validator 0
+127.0.0.1 9023 validator 0
+127.0.0.1 9024 validator 0
+127.0.0.1 9025 validator 0
+127.0.0.1 9026 validator 0
+127.0.0.1 9027 validator 0
+127.0.0.1 9028 validator 0
+127.0.0.1 9029 validator 0
+127.0.0.1 9030 validator 0
+127.0.0.1 19999 client 0