default void deleteNamespace(String name) throws IOException {
    get(deleteNamespaceAsync(name), getSyncWaitTimeout(), TimeUnit.MILLISECONDS);
  }
Delete an existing namespace. Only empty namespaces (no tables) can be removed. Blocks until
namespace has been successfully deleted or an exception is thrown.
@param name namespace name
@throws IOException if a remote or network exception occurs
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java