downgrade client to fix runtime permission (#134)

Author: jcantrill

pom.xml

@@ -52,7 +52,7 @@
   <properties>
     <elasticsearch.plugin.name>discovery-kubernetes</elasticsearch.plugin.name>
     <elasticsearch.version>6.2.3</elasticsearch.version>
-    <kubernetes-client.version>3.0.3</kubernetes-client.version>
+    <kubernetes-client.version>1.4.35</kubernetes-client.version>
     <tests.shuffle>true</tests.shuffle>
     <tests.output>onerror</tests.output>
     <tests.client.ratio />