Removing references to Geode internal classes (#155)

Geode internal classes shouldn't be used in the benchmarks. Using them makes it
harder to run tests against different versions of geode, since we don't make
garuantees about preserving the APIs of these classes between versions.

geode-benchmarks/src/main/java/benchmark/geode/data/Portfolio.java

@@ -23,9 +23,6 @@
 import java.util.List;
 import java.util.Map;
 
-import org.apache.geode.internal.Assert;
-
-
 public class Portfolio {
 
   public enum Day {
@@ -88,7 +85,6 @@ public Portfolio(long i) {
     collectionHolderMap.put("3", new CollectionHolder());
 
     unicodeṤtring = i % 2 == 0 ? "ṤṶẐ" : "ṤẐṶ";
-    Assert.assertTrue(unicodeṤtring.length() == 3);
   }
 
   public Portfolio(int i, int j) {

geode-benchmarks/src/main/java/org/apache/geode/benchmark/tasks/OQLQuery.java

@@ -14,8 +14,6 @@
  */
 package org.apache.geode.benchmark.tasks;
 
-import static org.apache.geode.util.internal.UncheckedUtils.uncheckedCast;
-
 import java.io.Serializable;
 import java.util.Map;
 import java.util.concurrent.ThreadLocalRandom;
@@ -59,6 +57,7 @@ public void setUp(BenchmarkConfiguration cfg) throws Exception {
   }
 
   @Override
+  @SuppressWarnings("unchecked")
   public boolean test(final Map<Object, Object> ctx) throws Exception {
     final long minId =
         ThreadLocalRandom.current().nextLong(keyRange.getMin(), keyRange.getMax() - queryRange);
@@ -67,7 +66,7 @@ public boolean test(final Map<Object, Object> ctx) throws Exception {
     final Object result = query.execute(minId, maxId);
 
     if (isValidationEnabled) {
-      verifyResults(uncheckedCast(result), minId, maxId);
+      verifyResults((SelectResults<Portfolio>) result, minId, maxId);
     }
 
     return true;

geode-benchmarks/src/main/java/org/apache/geode/benchmark/tasks/StartServer.java

@@ -23,10 +23,10 @@
 import java.net.InetAddress;
 import java.util.Properties;
 
+import org.apache.geode.cache.Cache;
 import org.apache.geode.cache.CacheFactory;
 import org.apache.geode.cache.server.CacheServer;
 import org.apache.geode.distributed.ConfigurationProperties;
-import org.apache.geode.internal.cache.InternalCache;
 import org.apache.geode.pdx.ReflectionBasedAutoSerializer;
 import org.apache.geode.perftest.Task;
 import org.apache.geode.perftest.TestContext;
@@ -53,7 +53,7 @@ public void run(TestContext context) throws Exception {
 
     final CacheFactory cacheFactory = new CacheFactory(properties);
     configureCacheFactory(cacheFactory, context);
-    final InternalCache cache = (InternalCache) cacheFactory.create();
+    final Cache cache = cacheFactory.create();
 
     final CacheServer cacheServer = configureCacheServer(cache.addCacheServer(), context);
     if (null != cacheServer) {