HDDS-1678. Default image name for kubernetes examples should be ozone and not hadoop

Closes #959

hadoop-ozone/dist/pom.xml

@@ -28,7 +28,7 @@
   <properties>
     <file.encoding>UTF-8</file.encoding>
     <downloadSources>true</downloadSources>
-    <docker.image>apache/hadoop:${project.version}</docker.image>
+    <docker.image>apache/ozone:${project.version}</docker.image>
     <docker.hadoop-runner.version>jdk11</docker.hadoop-runner.version>
   </properties>