REPO-4329 Configure Custom Renditions (#537)

Break done of changes:
-    Removed rendition definition spring beans and created 0100-baseRenditions.json. Changes are picked up periodically by the running system.
-    Refactored TransformServiceRegistryImpl to extract ConfigFileFinder to reads json from resources, files or directories.
 -   Refactored TransformServiceRegistryImpl to extract ConfigScheduler to periodically reads config data.
 -   Used ConfigFileFinder and ConfigScheduler in RenditionDefinition2Impl to read rendition defs.
 -   Removed the need for a current 'Data' parameter to be passed to register methods when adding transforms or renditions.
 -   Changes in test classes of AbstractRenditionIntegrationTests to force the config to be read once before each test, as tests were sometimes not getting the correct config due to scheduling.

src/test/java/org/alfresco/repo/rendition2/AbstractRenditionIntegrationTest.java

@@ -53,6 +53,7 @@ import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
+import org.quartz.CronExpression;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.util.ResourceUtils;
 
@@ -119,6 +120,9 @@ public abstract class AbstractRenditionIntegrationTest extends BaseSpringTest
     protected static final String ADMIN = "admin";
     protected static final String DOC_LIB = "doclib";
 
+    private CronExpression origLocalTransCron;
+    private CronExpression origRenditionCron;
+
     @BeforeClass
     public static void before()
     {
@@ -192,16 +196,25 @@ public abstract class AbstractRenditionIntegrationTest extends BaseSpringTest
         legacyTransformServiceRegistry.setEnabled(Boolean.parseBoolean(System.getProperty("legacy.transform.service.enabled")));
         legacyTransformServiceRegistry.afterPropertiesSet();
 
+        origLocalTransCron = localTransformServiceRegistry.getCronExpression();
+        localTransformServiceRegistry.setCronExpression(null);
         localTransformServiceRegistry.setEnabled(Boolean.parseBoolean(System.getProperty("local.transform.service.enabled")));
         localTransformServiceRegistry.afterPropertiesSet();
 
+        origRenditionCron = renditionDefinitionRegistry2.getCronExpression();
+        renditionDefinitionRegistry2.setCronExpression(null);
         renditionDefinitionRegistry2.setTransformServiceRegistry(transformServiceRegistry);
+        renditionDefinitionRegistry2.afterPropertiesSet();
+
         thumbnailRegistry.setTransformServiceRegistry(transformServiceRegistry);
     }
 
     @After
     public void cleanUp()
     {
+        localTransformServiceRegistry.setCronExpression(origLocalTransCron);
+        renditionDefinitionRegistry2.setCronExpression(origRenditionCron);
+
         AuthenticationUtil.clearCurrentSecurityContext();
     }