GORA-668 Remove usage of FixedHostPortGenericContainer

FixedHostPortGenericContainer might trigger port conflicts with existing containers / daemon on Jenkins node.

For instance, error might look like "Error starting userland proxy: listen tcp 0.0.0.0:5001: bind: address already in use"

Use standard testcontainers GenericContainer with random host port selection.
diff --git a/gora-mongodb/src/test/java/org/apache/gora/mongodb/MongoContainer.java b/gora-mongodb/src/test/java/org/apache/gora/mongodb/MongoContainer.java
index 9abf2a9..231d82c 100644
--- a/gora-mongodb/src/test/java/org/apache/gora/mongodb/MongoContainer.java
+++ b/gora-mongodb/src/test/java/org/apache/gora/mongodb/MongoContainer.java
@@ -18,14 +18,14 @@
 package org.apache.gora.mongodb;
 
 import com.mongodb.ServerAddress;
-import org.testcontainers.containers.FixedHostPortGenericContainer;
+import org.testcontainers.containers.GenericContainer;
 
 /**
- * Use {@link FixedHostPortGenericContainer}
+ * Use {@link GenericContainer}
  * from <a href="https://www.testcontainers.org/">Testcontainers.org</a> project
  * to handle a MongoDB docker container.
  */
-public class MongoContainer extends FixedHostPortGenericContainer<MongoContainer> {
+public class MongoContainer extends GenericContainer<MongoContainer> {
 
     public static final int MONGO_PORT = 27017;
 
diff --git a/gora-redis/src/test/java/org/apache/gora/redis/GoraRedisTestDriver.java b/gora-redis/src/test/java/org/apache/gora/redis/GoraRedisTestDriver.java
index 9af838e..1180b23 100755
--- a/gora-redis/src/test/java/org/apache/gora/redis/GoraRedisTestDriver.java
+++ b/gora-redis/src/test/java/org/apache/gora/redis/GoraRedisTestDriver.java
@@ -24,7 +24,6 @@
 import org.apache.gora.redis.util.RedisStartupLogWaitStrategy;
 import org.apache.gora.redis.util.ServerMode;
 import org.apache.gora.redis.util.StorageMode;
-import org.testcontainers.containers.FixedHostPortGenericContainer;
 import org.testcontainers.containers.GenericContainer;
 
 /**
@@ -34,7 +33,7 @@
 public class GoraRedisTestDriver extends GoraTestDriver {
 
   private static final String DOCKER_IMAGE = "grokzen/redis-cluster:latest";
-  private final FixedHostPortGenericContainer redisContainer;
+  private final GenericContainer redisContainer;
 
   private final StorageMode storageMode;
   private final ServerMode serverMode;
@@ -43,23 +42,12 @@
     super(RedisStore.class);
     this.storageMode = storageMode;
     this.serverMode = serverMode;
-    GenericContainer container = new FixedHostPortGenericContainer(DOCKER_IMAGE)
-        .withFixedExposedPort(7000, 7000)
-        .withFixedExposedPort(7001, 7001)
-        .withFixedExposedPort(7002, 7002)
-        .withFixedExposedPort(7003, 7003)
-        .withFixedExposedPort(7004, 7004)
-        .withFixedExposedPort(7005, 7005)
-        .withFixedExposedPort(7006, 7006)
-        .withFixedExposedPort(7007, 7007)
-        .withFixedExposedPort(5000, 5000)
-        .withFixedExposedPort(5001, 5001)
-        .withFixedExposedPort(5002, 5002)
+    GenericContainer container = new GenericContainer(DOCKER_IMAGE)
         .waitingFor(new RedisStartupLogWaitStrategy())
         .withStartupTimeout(Duration.ofMinutes(3))
         .withEnv("STANDALONE", "true")
         .withEnv("SENTINEL", "true");
-    redisContainer = (FixedHostPortGenericContainer) container;
+    redisContainer = container;
 
   }
 
diff --git a/gora-rethinkdb/src/test/java/org/apache/gora/rethinkdb/store/RethinkDBGoraDataStoreTest.java b/gora-rethinkdb/src/test/java/org/apache/gora/rethinkdb/store/RethinkDBGoraDataStoreTest.java
index 0270da2..23edbbc 100644
--- a/gora-rethinkdb/src/test/java/org/apache/gora/rethinkdb/store/RethinkDBGoraDataStoreTest.java
+++ b/gora-rethinkdb/src/test/java/org/apache/gora/rethinkdb/store/RethinkDBGoraDataStoreTest.java
@@ -28,7 +28,6 @@
 import org.junit.Ignore;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.testcontainers.containers.FixedHostPortGenericContainer;
 import org.testcontainers.containers.GenericContainer;
 
 import java.time.Duration;
@@ -43,8 +42,7 @@
   private static final String DOCKER_CONTAINER_NAME = "rethinkdb:2.3.6";
 
   @ClassRule
-  public static GenericContainer rethinkdbContainer = new FixedHostPortGenericContainer(DOCKER_CONTAINER_NAME)
-          .withFixedExposedPort(28015, 28015)
+  public static GenericContainer rethinkdbContainer = new GenericContainer(DOCKER_CONTAINER_NAME)
           .waitingFor(new RethinkDBStartupWaitStrategy())
           .withStartupTimeout(Duration.ofSeconds(10));