#1343 - Update for ... #1283 ENH: Support simplified test configuration (with docker setup typically via application-test.yml)

DefaultContainer with config.loadFromProperties(PropertiesLoader.load()); effectively runs eval twice on properties which is unnecessary.

Additionally add ServerConfig.setRunMigration() because I think it makes more sense / easier to find.

Remote PropertiesLoader.setProperty() as it is no longer required for the ebean-test-config plugin.

src/main/java/io/ebeaninternal/server/core/DefaultContainer.java

@@ -83,7 +83,7 @@ public class DefaultContainer implements SpiContainer {
 
     ServerConfig config = new ServerConfig();
     config.setName(name);
-    config.loadFromProperties(PropertiesLoader.load());
+    config.loadFromProperties();
 
     return createServer(config);
   }