[hbase20] update hbase 2 version to 2.0.0 GA

pom.xml

@@ -86,7 +86,7 @@ LICENSE file.
     <hbase10.version>1.0.2</hbase10.version>
     <hbase12.version>1.2.5</hbase12.version>
     <hbase14.version>1.4.2</hbase14.version>
-    <hbase20.version>2.0.0-beta-2</hbase20.version>
+    <hbase20.version>2.0.0</hbase20.version>
     <hypertable.version>0.9.5.6</hypertable.version>
     <infinispan.version>7.2.2.Final</infinispan.version>
     <kudu.version>1.6.0</kudu.version>