Remove java-repo-tools subtree.

Use the published parent pom now that it is in Maven central.

Author: tswast

bigtable/hbase/snippets/src/main/java/com/example/cloud/bigtable/helloworld/HelloWorld.java

@@ -52,7 +52,7 @@ public class HelloWorld {
       { "Hello World!", "Hello Cloud Bigtable!", "Hello HBase!" };
 
   /**
-   * Connects to Cloud Bigtable, runs some basic operations and prints the results
+   * Connects to Cloud Bigtable, runs some basic operations and prints the results.
    */
   private static void doHelloWorld(String projectId, String instanceId) {