invalidation: don't create CacheInvalidation records on startup

Creating the records early gave an advantage before lightweight was introduced.
With lightweight it is no longer necessary.

The records will be created on demand anyway and there is no reason to create and
maintain them before they are used.

rhodecode/lib/utils.py

@@ -472,11 +472,6 b' def repo2db_mapper(initial_repo_list, re'
         elif install_git_hook:
             if db_repo.repo_type == 'git':
                 ScmModel().install_git_hook(db_repo.scm_instance)
-        # during starting install all cache keys for all repositories in the
-        # system, this will register all repos and multiple instances
-        cache_key = CacheInvalidation._get_cache_key(name)
-        log.debug("Creating invalidation cache key for %s: %s", name, cache_key)
-        CacheInvalidation.test_and_set_valid(name, None)
 
     sa.commit()
     removed = []

rhodecode/tests/api/api_base.py

@@ -264,6 +264,9 b' class BaseTestApi(object):'
         self._compare_error(id_, expected, given=response.body)
 
     def test_api_invalidate_cache(self):
+        repo = RepoModel().get_by_repo_name(self.REPO)
+        repo.scm_instance_cached() # seed cache
+
         id_, params = _build_data(self.apikey, 'invalidate_cache',
                                   repoid=self.REPO)
         response = api_call(self, params)