Update rsk-testnet-2 with new rskj-testnet role

nodes/rsk-testnet-2.json

@@ -32,6 +32,7 @@
       "postfix::_attributes",
       "postfix::sasl_auth",
       "hostname::default",
+      "kosmos_rsk::firewall",
       "firewall::default",
       "chef-sugar::default"
     ],
@@ -52,6 +53,6 @@
   },
   "run_list": [
     "recipe[kosmos-base]",
-    "role[rsk_testnet]"
+    "role[rskj_testnet]"
   ]
-}
+}