Fix Grafana dashboards

This commit fixes the InfluxDB queries used in Grafana dashboards. A regexp
should be used with variables.
diff --git a/grafana/files/dashboards/Heat.json b/grafana/files/dashboards/Heat.json
index 917c536..6ef8a49 100644
--- a/grafana/files/dashboards/Heat.json
+++ b/grafana/files/dashboards/Heat.json
@@ -92,7 +92,7 @@
               "interval": "",
               "measurement": "cluster_status",
               "policy": "default",
-              "query": "SELECT last(\"value\") FROM \"cluster_status\" WHERE \"environment_label\" = '$environment' AND \"cluster_name\" = 'heat' AND $timeFilter GROUP BY time($interval) fill(null)",
+              "query": "SELECT last(\"value\") FROM \"cluster_status\" WHERE \"environment_label\" =~ /^$environment$/ AND \"cluster_name\" = 'heat' AND $timeFilter GROUP BY time($interval) fill(null)",
               "rawQuery": false,
               "refId": "A",
               "resultFormat": "time_series",
@@ -595,7 +595,7 @@
               "groupByTags": [],
               "measurement": "openstack_check_api",
               "policy": "default",
-              "query": "SELECT last(\"value\") FROM \"openstack_check_api\" WHERE \"environment_label\" = '$environment' AND \"service\" = 'heat-api' AND $timeFilter GROUP BY time($interval) fill(0)",
+              "query": "SELECT last(\"value\") FROM \"openstack_check_api\" WHERE \"environment_label\" =~ /^$environment$/ AND \"service\" = 'heat-api' AND $timeFilter GROUP BY time($interval) fill(0)",
               "rawQuery": false,
               "refId": "A",
               "resultFormat": "time_series",
@@ -1088,7 +1088,7 @@
               "groupByTags": [],
               "measurement": "haproxy_backend_servers",
               "policy": "default",
-              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" = '$environment' AND \"backend\" = 'heat-api' AND \"state\" = 'up' AND $timeFilter GROUP BY time($interval) fill(null)",
+              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" =~ /^$environment$/ AND \"backend\" = 'heat-api' AND \"state\" = 'up' AND $timeFilter GROUP BY time($interval) fill(null)",
               "rawQuery": false,
               "refId": "A",
               "resultFormat": "time_series",
@@ -1197,7 +1197,7 @@
               "groupByTags": [],
               "measurement": "haproxy_backend_servers",
               "policy": "default",
-              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" = '$environment' AND \"backend\" = 'heat-cfn-api' AND \"state\" = 'up' AND $timeFilter GROUP BY time($interval) fill(null)",
+              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" =~ /^$environment$/ AND \"backend\" = 'heat-cfn-api' AND \"state\" = 'up' AND $timeFilter GROUP BY time($interval) fill(null)",
               "rawQuery": false,
               "refId": "A",
               "resultFormat": "time_series",
@@ -1330,7 +1330,7 @@
               "groupByTags": [],
               "measurement": "haproxy_backend_servers",
               "policy": "default",
-              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" = '$environment' AND \"backend\" = 'heat-api' AND \"state\" = 'down' AND $timeFilter GROUP BY time($interval) fill(null)",
+              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" =~ /^$environment$/ AND \"backend\" = 'heat-api' AND \"state\" = 'down' AND $timeFilter GROUP BY time($interval) fill(null)",
               "rawQuery": false,
               "refId": "A",
               "resultFormat": "time_series",
@@ -1439,7 +1439,7 @@
               "groupByTags": [],
               "measurement": "haproxy_backend_servers",
               "policy": "default",
-              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" = '$environment' AND \"backend\" = 'heat-cfn-api' AND \"state\" = 'down' AND $timeFilter GROUP BY time($interval) fill(null)",
+              "query": "SELECT last(\"value\") FROM \"haproxy_backend_servers\" WHERE \"environment_label\" =~ /^$environment$/ AND \"backend\" = 'heat-cfn-api' AND \"state\" = 'down' AND $timeFilter GROUP BY time($interval) fill(null)",
               "rawQuery": false,
               "refId": "A",
               "resultFormat": "time_series",
@@ -1534,7 +1534,7 @@
         "includeAll": true,
         "name": "server",
         "options": [],
-        "query": "show tag values from pacemaker_local_resource_active with key = hostname where environment_label = '$environment'",
+        "query": "show tag values from pacemaker_local_resource_active with key = hostname where environment_label =~ /^$environment$/",
         "refresh": 1,
         "refresh_on_load": true,
         "regex": "",