Fix nightly failure for pmc-nio-3nodes job (elastic#117)

We need to run 3 nodes job before 1 node job, since apart from the number of nodes they are identical and night-rally doesn’t think it needs to rebuild.

Author: ebadyano

night_rally/resources/race-configs-group-2.json

@@ -149,15 +149,14 @@
                 "car": "4gheap"
               },
               {
-                "name": "pmc-nio-4g-1node",
-                "label": "nio-4g-1node",
+                "name": "pmc-nio-4g-3nodes",
+                "label": "nio-4g-3nodes",
                 "charts": [
-                  "indexing",
-                  "query"
+                  "indexing"
                 ],
-                "challenge": "append-no-conflicts",
+                "challenge": "append-no-conflicts-index-only",
                 "track-params": {
-                  "number_of_replicas": 0
+                  "number_of_replicas": 1
                 },
                 "car": [
                   "4gheap",
@@ -170,17 +169,18 @@
                   }
                 },
                 "plugins": "transport-nio:transport+http",
-                "node-count": 1
+                "node-count": 3
               },
               {
-                "name": "pmc-nio-4g-3nodes",
-                "label": "nio-4g-3nodes",
+                "name": "pmc-nio-4g-1node",
+                "label": "nio-4g-1node",
                 "charts": [
-                  "indexing"
+                  "indexing",
+                  "query"
                 ],
-                "challenge": "append-no-conflicts-index-only",
+                "challenge": "append-no-conflicts",
                 "track-params": {
-                  "number_of_replicas": 1
+                  "number_of_replicas": 0
                 },
                 "car": [
                   "4gheap",
@@ -193,7 +193,7 @@
                   }
                 },
                 "plugins": "transport-nio:transport+http",
-                "node-count": 3
+                "node-count": 1
               },
               {
                 "name": "pmc-appendsorted-4g-1node",
@@ -262,15 +262,14 @@
                 "car": "4gheap"
               },
               {
-                "name": "pmc-nio-4g-1node",
-                "label": "nio-4g-1node",
+                "name": "pmc-nio-4g-3nodes",
+                "label": "nio-4g-3nodes",
                 "charts": [
-                  "indexing",
-                  "query"
+                  "indexing"
                 ],
-                "challenge": "append-no-conflicts",
+                "challenge": "append-no-conflicts-index-only",
                 "track-params": {
-                  "number_of_replicas": 0
+                  "number_of_replicas": 1
                 },
                 "car": [
                   "4gheap",
@@ -283,17 +282,18 @@
                   }
                 },
                 "plugins": "transport-nio:transport+http",
-                "node-count": 1
+                "node-count": 3
               },
               {
-                "name": "pmc-nio-4g-3nodes",
-                "label": "nio-4g-3nodes",
+                "name": "pmc-nio-4g-1node",
+                "label": "nio-4g-1node",
                 "charts": [
-                  "indexing"
+                  "indexing",
+                  "query"
                 ],
-                "challenge": "append-no-conflicts-index-only",
+                "challenge": "append-no-conflicts",
                 "track-params": {
-                  "number_of_replicas": 1
+                  "number_of_replicas": 0
                 },
                 "car": [
                   "4gheap",
@@ -306,7 +306,7 @@
                   }
                 },
                 "plugins": "transport-nio:transport+http",
-                "node-count": 3
+                "node-count": 1
               },
               {
                 "name": "pmc-appendsorted-4g-1node",