Migrate to Flogger (green)

This is a 'green' Flogger migration CL. Green CLs are intended to be as
safe as possible and should be easy to review and submit.

No changes should be necessary to the code itself prior to submission,
but small changes to BUILD files may be required.

Changes within files are completely independent of each other, so this CL
can be safely split up for review using tools such as Rosie.

For more information, see []
Base CL: 197826149

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=198560170

java/google/registry/tools/server/CreateGroupsAction.java

@@ -19,7 +19,7 @@ import static google.registry.request.Action.Method.POST;
 import static java.util.Arrays.asList;
 import static javax.servlet.http.HttpServletResponse.SC_OK;
 
-import com.google.common.logging.FormattingLogger;
+import com.google.common.flogger.FluentLogger;
 import google.registry.config.RegistryConfig.Config;
 import google.registry.groups.GroupsConnection;
 import google.registry.groups.GroupsConnection.Role;
@@ -50,7 +50,7 @@ public class CreateGroupsAction implements Runnable {
   public static final String PATH = "/_dr/admin/createGroups";
   public static final String CLIENT_ID_PARAM = "clientId";
 
-  private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
+  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
   private static final int NUM_SIMULTANEOUS_CONNECTIONS = 5;
 
   @Inject GroupsConnection groupsConnection;
@@ -97,11 +97,9 @@ public class CreateGroupsAction implements Runnable {
         if (e.isPresent()) {
           responseWriter.append(types.get(i).getDisplayName()).append(" => ");
           e.get().printStackTrace(responseWriter);
-          logger.severefmt(
-              e.get(),
+          logger.atSevere().withCause(e.get()).log(
               "Could not create Google Group for registrar %s for type %s",
-              registrar.getRegistrarName(),
-              types.get(i).toString());
+              registrar.getRegistrarName(), types.get(i));
         } else {
           responseWriter.printf("%s => Success%n", types.get(i).getDisplayName());
         }
@@ -110,7 +108,8 @@ public class CreateGroupsAction implements Runnable {
     } else {
       response.setStatus(SC_OK);
       response.setPayload("Success!");
-      logger.infofmt("Successfully created groups for registrar: %s", registrar.getRegistrarName());
+      logger.atInfo().log(
+          "Successfully created groups for registrar: %s", registrar.getRegistrarName());
     }
   }
 
@@ -128,7 +127,7 @@ public class CreateGroupsAction implements Runnable {
   }
 
   private void respondToBadRequest(String message) {
-    logger.severe(message);
+    logger.atSevere().log(message);
     throw new BadRequestException(message);
   }
 }