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-test/src/main/java/sonia/scm/TempDirRepositoryLocationResolver.java

@@ -1,7 +1,6 @@
 package sonia.scm;
 
 import sonia.scm.repository.BasicRepositoryLocationResolver;
-import sonia.scm.repository.RepositoryLocationResolver;
 
 import java.io.File;
 import java.nio.file.Path;
@@ -16,6 +15,16 @@ public class TempDirRepositoryLocationResolver extends BasicRepositoryLocationRe
 
   @Override
   protected <T> RepositoryLocationResolverInstance<T> create(Class<T> type) {
-    return repositoryId -> (T) tempDirectory.toPath();
+    return new RepositoryLocationResolverInstance<T>() {
+      @Override
+      public T getLocation(String repositoryId) {
+        return (T) tempDirectory.toPath();
+      }
+
+      @Override
+      public void setLocation(String repositoryId, T location) {
+        throw new UnsupportedOperationException("not implemented for tests");
+      }
+    };
   }
 }