Fix error when creating session in Astra example

This commit can be reverted once JAVA-2813 is implemented.

Author: adutra

examples/src/main/java/com/datastax/oss/driver/examples/astra/AstraReadCassandraVersion.java

@@ -16,6 +16,7 @@
 package com.datastax.oss.driver.examples.astra;
 
 import com.datastax.oss.driver.api.core.CqlSession;
+import com.datastax.oss.driver.api.core.config.DriverConfigLoader;
 import com.datastax.oss.driver.api.core.cql.ResultSet;
 import com.datastax.oss.driver.api.core.cql.Row;
 import java.nio.file.Paths;
@@ -56,6 +57,7 @@ public static void main(String[] args) {
             .withCloudSecureConnectBundle(Paths.get("/path/to/secure-connect-database_name.zip"))
             // Change the user_name and password here for the Astra instance
             .withAuthCredentials("user_name", "fakePasswordForTests")
+            .withConfigLoader(DriverConfigLoader.fromClasspath("application-astra"))
             // Uncomment the next line to use a specific keyspace
             // .withKeyspace("keyspace_name")
             .build()) {

examples/src/main/resources/application-astra.conf

@@ -0,0 +1 @@
+datastax-java-driver { }