Use new datastore client that permits IP addresses for localhost (#1002)

Author: ajkannan

gcloud-java-datastore/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>com.google.cloud.datastore</groupId>
       <artifactId>datastore-v1beta3-proto-client</artifactId>
-      <version>1.0.0-beta</version>
+      <version>1.0.0-beta.2</version>
     </dependency>
     <dependency>
       <groupId>${project.groupId}</groupId>