GEODE-10308: Close the cache after stopping the Tomcat container (#7739)

diff --git a/extensions/geode-modules-tomcat8/src/distributedTest/java/org/apache/geode/modules/session/Tomcat8SessionsClientServerDUnitTest.java b/extensions/geode-modules-tomcat8/src/distributedTest/java/org/apache/geode/modules/session/Tomcat8SessionsClientServerDUnitTest.java
index 276a4c2..9de6885 100644
--- a/extensions/geode-modules-tomcat8/src/distributedTest/java/org/apache/geode/modules/session/Tomcat8SessionsClientServerDUnitTest.java
+++ b/extensions/geode-modules-tomcat8/src/distributedTest/java/org/apache/geode/modules/session/Tomcat8SessionsClientServerDUnitTest.java
@@ -104,8 +104,6 @@
 
   @After
   public void tearDown() {
-    clientCache.close();
-    clientCache = null;
     port = -1;
 
     server.stopContainer();
@@ -115,5 +113,7 @@
     sessionManager = null;
     region = null;
 
+    clientCache.close();
+    clientCache = null;
   }
 }