Feature/contitional test runner (#1132)

* FIX: warnings (add generics, overrides, fix imports) - should be no effecive code change

* replaced deprecated methods by default methods

* FIX: more compiler warnings

* FIX more warnings - no code changes

* FIX: deprecated call to JsonParseException

* Remove unused code, check unused variables

* ADD: ContitonaltestRunner to skip tests for certain platforms

* Use annotations to control on which platforms a test shoud run

* FIX: compile errors

src/test/java/org/tests/idkeys/TestGeneratedKeys.java

@@ -1,7 +1,9 @@
 package org.tests.idkeys;
 
 import io.ebean.BaseTestCase;
+import io.ebean.Platform;
 import io.ebean.Transaction;
+import io.ebean.annotation.ForPlatform;
 import io.ebean.config.dbplatform.IdType;
 import io.ebeaninternal.api.SpiEbeanServer;
 import org.junit.Test;
@@ -17,6 +19,7 @@ import static org.junit.Assert.*;
 public class TestGeneratedKeys extends BaseTestCase {
 
   @Test
+  @ForPlatform(Platform.H2) // readSequenceValue is H2 specific
   public void testSequence() throws SQLException {
     SpiEbeanServer server = spiEbeanServer();
     IdType idType = server.getDatabasePlatform().getDbIdentity().getIdType();
@@ -24,10 +27,6 @@ public class TestGeneratedKeys extends BaseTestCase {
       // only run this test when SEQUENCE is being used
       return;
     }
-    if (!isH2()) {
-      // readSequenceValue is H2 specific
-      return;
-    }
 
     Transaction tx = server.beginTransaction();