tasks: normalize the url argument name of most lister

Since all the listing tasks accepts an url as first argument (whatever the
argument name is), it makes sense to use a simple common argument name for
this. I've chosen 'url' instead of api_baseurl/forge_url/url.

Also kill now useless `new_lister()` functions.

swh/lister/github/tasks.py

@@ -12,20 +12,16 @@ from swh.lister.github.lister import GitHubLister
 GROUP_SPLIT = 10000
 
 
-def new_lister(api_baseurl='https://api.github.com', **kw):
-    return GitHubLister(api_baseurl=api_baseurl, **kw)
-
-
 @app.task(name=__name__ + '.IncrementalGitHubLister')
 def list_github_incremental(**lister_args):
     'Incremental update of GitHub'
-    lister = new_lister(**lister_args)
+    lister = GitHubLister(**lister_args)
     lister.run(min_bound=lister.db_last_index(), max_bound=None)
 
 
 @app.task(name=__name__ + '.RangeGitHubLister')
 def _range_github_lister(start, end, **lister_args):
-    lister = new_lister(**lister_args)
+    lister = GitHubLister(**lister_args)
     lister.run(min_bound=start, max_bound=end)
 
 
@@ -36,7 +32,7 @@ def list_github_full(self, split=None, **lister_args):
     It's not to be called for an initial listing.
 
     """
-    lister = new_lister(**lister_args)
+    lister = GitHubLister(**lister_args)
     ranges = lister.db_partition_indices(split or GROUP_SPLIT)
     if not ranges:
         self.log.info('Nothing to list')

swh/lister/github/tests/test_tasks.py

@@ -26,7 +26,7 @@ def test_incremental(lister, swh_app, celery_session_worker):
     res.wait()
     assert res.successful()
 
-    lister.assert_called_once_with(api_baseurl='https://api.github.com')
+    lister.assert_called_once_with()
     lister.db_last_index.assert_called_once_with()
     lister.run.assert_called_once_with(min_bound=42, max_bound=None)
 
@@ -44,7 +44,7 @@ def test_range(lister, swh_app, celery_session_worker):
     res.wait()
     assert res.successful()
 
-    lister.assert_called_once_with(api_baseurl='https://api.github.com')
+    lister.assert_called_once_with()
     lister.db_last_index.assert_not_called()
     lister.run.assert_called_once_with(min_bound=12, max_bound=42)
 
@@ -74,7 +74,7 @@ def test_relister(lister, swh_app, celery_session_worker):
             break
         sleep(1)
 
-    lister.assert_called_with(api_baseurl='https://api.github.com')
+    lister.assert_called_with()
 
     # one by the FullGitHubRelister task
     # + 5 for the RangeGitHubLister subtasks