Fix decimals field which breaks plots

These plots show integer quanties, so set decimals to 0. It isn't
clear where the -1 setting came from, but it breaks the plot entirely
on Grafana 11.

Author: dougszumski

etc/kayobe/kolla/config/grafana/dashboards/openstack/rabbitmq.json

@@ -1785,7 +1785,7 @@
               "mode": "line+area"
             }
           },
-          "decimals": -1,
+          "decimals": 0,
           "mappings": [],
           "thresholds": {
             "mode": "absolute",
@@ -2040,7 +2040,7 @@
               "mode": "line+area"
             }
           },
-          "decimals": -1,
+          "decimals": 0,
           "mappings": [],
           "thresholds": {
             "mode": "absolute",
@@ -4421,7 +4421,7 @@
       },
       "yaxes": [
         {
-          "decimals": -1,
+          "decimals": 0,
           "format": "short",
           "label": "",
           "logBase": 1,
@@ -5013,7 +5013,7 @@
       },
       "yaxes": [
         {
-          "decimals": -1,
+          "decimals": 0,
           "format": "short",
           "label": "",
           "logBase": 1,
@@ -5457,7 +5457,7 @@
       },
       "yaxes": [
         {
-          "decimals": -1,
+          "decimals": 0,
           "format": "short",
           "label": "",
           "logBase": 1,