Mark config entry stores explicitly in exports (#1545)

The default (XML) store of SCM-Manager does not distinguish between config and config entry stores in regards to
storage locations. Nonetheless, we want to make a difference in export files, so that other store providers can handle
these stores differently. To do so, this change adds an attribute to the top level xml element of config entry stores
to mark them. In exports, these store files can now be exported in a different folder. To mark existing stores, this
introduces an update step.

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

@@ -66,9 +66,6 @@ public class AbstractTestBase
 
   private File tempDirectory;
 
-  protected DefaultFileSystem fileSystem;
-
-  protected RepositoryDAO repositoryDAO = mock(RepositoryDAO.class);
   protected RepositoryLocationResolver repositoryLocationResolver;
 
   @BeforeEach
@@ -79,7 +76,6 @@ public class AbstractTestBase
       UUID.randomUUID().toString());
     assertTrue(tempDirectory.mkdirs());
     contextProvider = MockUtil.getSCMContextProvider(tempDirectory);
-    fileSystem = new DefaultFileSystem();
     InitialRepositoryLocationResolver initialRepoLocationResolver = new InitialRepositoryLocationResolver();
     repositoryLocationResolver = new TempDirRepositoryLocationResolver(tempDirectory);
     postSetUp();