fix sortByName calls

in grafana, if you add them manually, it's without quotes
in graphite docs, is also without quotes
(http://graphite.readthedocs.io/en/latest/functions.html#graphite.render.functions.sortByName)

MT doesn't support booleans like that:

~/g/s/g/g/metrictank ❯❯❯ ./build/mt-explain "sortByName(foo, 'true')"                                                                                                                        ⏎
Error while planning argument bad type. expected string - got etString
~/g/s/g/g/metrictank ❯❯❯ ./build/mt-explain "sortByName(foo, true)"
Plan:
* Exprs:
  expr-func sortByName(
    expr-target "foo",
HUH-SHOULD-NEVER-HAPPEN,
  )
* Reqs:
    {foo 1517332946 1517419346 NoneConsolidator}
MaxDataPoints: 800
From: 1517332946
To: 1517419346

Author: Dieterbe

dashboard.json

@@ -521,7 +521,7 @@
           "targets": [
             {
               "refId": "A",
-              "target": "sortByName(aliasByNode(metrictank.stats.$environment.$instance.cluster.notifier.kafka.partition.*.lag.gauge64, 3, 8), 'true')"
+              "target": "sortByName(aliasByNode(metrictank.stats.$environment.$instance.cluster.notifier.kafka.partition.*.lag.gauge64, 3, 8), true)"
             }
           ],
           "thresholds": [],
@@ -591,7 +591,7 @@
           "targets": [
             {
               "refId": "A",
-              "target": "sortByName(aliasByNode(metrictank.stats.$environment.$instance.input.kafka-mdm.partition.*.lag.gauge64, 3, 7), 'true')"
+              "target": "sortByName(aliasByNode(metrictank.stats.$environment.$instance.input.kafka-mdm.partition.*.lag.gauge64, 3, 7), true)"
             }
           ],
           "thresholds": [],
@@ -1171,7 +1171,7 @@
           "targets": [
             {
               "refId": "A",
-              "target": "aliasByNode(sortByName(sumSeriesWithWildcards(perSecond(metrictank.stats.$environment.$instance.api.request.*.status.*.counter32), 3), 'true'), 5, 7)"
+              "target": "aliasByNode(sortByName(sumSeriesWithWildcards(perSecond(metrictank.stats.$environment.$instance.api.request.*.status.*.counter32), 3), true), 5, 7)"
             }
           ],
           "thresholds": [],