Cleanup

- Mark PathBasedRepositoryLocationResolver as singleton so that other
  users will get the same instance and will not overwrite the paths
  set by migration.
- Set path kept by InlineMigrationStrategy in location resolver to
  store the path.
- Add logging
- Add type of repository to migration web page

scm-core/src/main/java/sonia/scm/repository/RepositoryLocationResolver.java

@@ -13,8 +13,9 @@ public abstract class RepositoryLocationResolver {
     return create(type);
   }
 
-  @FunctionalInterface
   public interface RepositoryLocationResolverInstance<T> {
     T getLocation(String repositoryId);
+
+    void setLocation(String repositoryId, T location);
   }
 }