GEODE-8577: Increase time to get Redis native connection (#5874)

- It's possible that the test is exhausting the number of available
  sockets. Closed connections sit in TIME_WAIT for 60 seconds on Linux.
  This change increases the time to get a connection beyond that to
  allow for connections to be fully closed and ports to be released.
diff --git a/geode-redis/src/acceptanceTest/java/org/apache/geode/redis/internal/executor/pubsub/PubSubNativeRedisAcceptanceTest.java b/geode-redis/src/acceptanceTest/java/org/apache/geode/redis/internal/executor/pubsub/PubSubNativeRedisAcceptanceTest.java
index 772ebb1..ce7778f 100644
--- a/geode-redis/src/acceptanceTest/java/org/apache/geode/redis/internal/executor/pubsub/PubSubNativeRedisAcceptanceTest.java
+++ b/geode-redis/src/acceptanceTest/java/org/apache/geode/redis/internal/executor/pubsub/PubSubNativeRedisAcceptanceTest.java
@@ -16,11 +16,9 @@
 package org.apache.geode.redis.internal.executor.pubsub;
 
 import org.junit.ClassRule;
-import org.junit.Ignore;
 
 import org.apache.geode.NativeRedisTestRule;
 
-@Ignore("GEODE-8577")
 public class PubSubNativeRedisAcceptanceTest extends AbstractPubSubIntegrationTest {
   @ClassRule
   public static NativeRedisTestRule redis = new NativeRedisTestRule();
diff --git a/geode-redis/src/integrationTest/java/org/apache/geode/redis/internal/executor/pubsub/AbstractPubSubIntegrationTest.java b/geode-redis/src/integrationTest/java/org/apache/geode/redis/internal/executor/pubsub/AbstractPubSubIntegrationTest.java
index 9e3f323..832441a 100644
--- a/geode-redis/src/integrationTest/java/org/apache/geode/redis/internal/executor/pubsub/AbstractPubSubIntegrationTest.java
+++ b/geode-redis/src/integrationTest/java/org/apache/geode/redis/internal/executor/pubsub/AbstractPubSubIntegrationTest.java
@@ -715,7 +715,7 @@
   private Jedis getConnection() {
     Exception lastException = null;
 
-    for (int i = 0; i < 10; i++) {
+    for (int i = 0; i < 20; i++) {
       Jedis client = null;
       try {
         client = new Jedis("localhost", getPort(), JEDIS_TIMEOUT);
@@ -731,7 +731,7 @@
         }
       }
       try {
-        Thread.sleep(1000);
+        Thread.sleep(5000);
       } catch (InterruptedException e) {
         e.printStackTrace();
       }