Fix usage of AntTaskLogger.

Motivation
----------

Liquibase has a fairly new logging abstraction and it wasn't entirely working with the Ant tasks. The tasks were reverting to standard out logging which might make it difficult to control log levels correctly in Ant tasks.

Modifications
-------------

I leveraged the new Scope system (pretty neat!) to add the AntLogService manually. This log service creates the AntTaskLogger correctly so the logger delegates to Ant's logger again.

Result
------

The ant tasks once again handle Liquibase logs correctly.

(cherry picked from commit 499ac6a)

liquibase-core/src/main/java/liquibase/integration/ant/AntTaskLogService.java

@@ -1,20 +1,17 @@
 package liquibase.integration.ant;
 
-import liquibase.integration.ant.AntTaskLogger;
 import liquibase.logging.LogService;
 import liquibase.logging.Logger;
 import liquibase.logging.core.AbstractLogService;
 import org.apache.tools.ant.Task;
 
-import java.util.logging.Level;
-
 /**
  * An implementation of the Liquibase LogService that logs all messages to the given Ant task. This should only be used
  * inside of Ant tasks.
  */
 public final class AntTaskLogService extends AbstractLogService {
 
-    private AntTaskLogger logger;
+    private final AntTaskLogger logger;
 
     public AntTaskLogService(Task task) {
         logger = new AntTaskLogger(task, this.filter);

liquibase-core/src/main/java/liquibase/integration/ant/BaseLiquibaseTask.java

@@ -32,6 +32,8 @@
 public abstract class BaseLiquibaseTask extends Task {
     private static ResourceBundle coreBundle = getBundle("liquibase/i18n/liquibase-core");
 
+    private final Map<String, Object> scopeValues = new HashMap<>();
+
     private AntClassLoader classLoader;
     private Liquibase liquibase;
 
@@ -46,7 +48,7 @@ public BaseLiquibaseTask() {
 
     @Override
     public void init() throws BuildException {
-//        LogService.setLoggerFactory(new AntTaskLogService(this));
+        scopeValues.put(Scope.Attr.logService.name(), new AntTaskLogService(this));
         classpath = new Path(getProject());
     }
 
@@ -61,7 +63,6 @@ public final void execute() throws BuildException {
         final Database[] database = {null};
         try {
             ResourceAccessor resourceAccessor = createResourceAccessor(classLoader);
-            Map<String, Object> scopeValues = new HashMap<>();
             scopeValues.put(Scope.Attr.resourceAccessor.name(), resourceAccessor);
             scopeValues.put(Scope.Attr.classLoader.name(), classLoader);