Reverted delete zombie repos on server start, this can be misleading, and somehow dangerous option.

It's better that server restarts as fast as possible without any magical functions going on. Cleanup can be still made from rescan option in admin

rhodecode/config/environment.py

@@ -88,7 +88,7 b' def load_environment(global_conf, app_co'
 
     repos_path = make_ui('db').configitems('paths')[0][1]
     repo2db_mapper(ScmModel().repo_scan(repos_path),
-                   remove_obsolete=True,)
+                   remove_obsolete=False, install_git_hook=False)
     set_available_permissions(config)
     config['base_path'] = repos_path
     set_rhodecode_config(config)