Make SourcesList __init__ method also set self.module

This was originally required to allow other methods in SourcesList to
fail, but subsequent changes rendered that unnecessary, and it's just
a cleanup now, and avoids passing in module separately to save().

packaging/os/apt_repository.py

@@ -124,7 +124,8 @@ class InvalidSource(Exception):
 # Simple version of aptsources.sourceslist.SourcesList.
 # No advanced logic and no backups inside.
 class SourcesList(object):
-    def __init__(self):
+    def __init__(self, module):
+        self.module = module
         self.files = {}  # group sources by file
         # Repositories that we're adding -- used to implement mode param
         self.new_repos = set()
@@ -234,7 +235,7 @@ class SourcesList(object):
             group.append((n, valid, enabled, source, comment))
         self.files[file] = group
 
-    def save(self, module):
+    def save(self):
         for filename, sources in self.files.items():
             if sources:
                 d, fn = os.path.split(filename)
@@ -255,13 +256,13 @@ class SourcesList(object):
                     try:
                         f.write(line)
                     except IOError, err:
-                        module.fail_json(msg="Failed to write to file %s: %s" % (tmp_path, unicode(err)))
-                module.atomic_move(tmp_path, filename)
+                        self.module.fail_json(msg="Failed to write to file %s: %s" % (tmp_path, unicode(err)))
+                self.module.atomic_move(tmp_path, filename)
 
                 # allow the user to override the default mode
                 if filename in self.new_repos:
-                    this_mode = module.params['mode']
-                    module.set_mode_if_different(filename, this_mode, False)
+                    this_mode = self.module.params['mode']
+                    self.module.set_mode_if_different(filename, this_mode, False)
             else:
                 del self.files[filename]
                 if os.path.exists(filename):
@@ -329,7 +330,7 @@ class UbuntuSourcesList(SourcesList):
     def __init__(self, module, add_ppa_signing_keys_callback=None):
         self.module = module
         self.add_ppa_signing_keys_callback = add_ppa_signing_keys_callback
-        super(UbuntuSourcesList, self).__init__()
+        super(UbuntuSourcesList, self).__init__(module)
 
     def _get_ppa_info(self, owner_name, ppa_name):
         lp_api = self.LP_API % (owner_name, ppa_name)
@@ -438,7 +439,7 @@ def main():
         sourceslist = UbuntuSourcesList(module,
             add_ppa_signing_keys_callback=get_add_ppa_signing_key_callback(module))
     elif isinstance(distro, aptsources_distro.DebianDistribution) or isinstance(distro, aptsources_distro.Distribution):
-        sourceslist = SourcesList()
+        sourceslist = SourcesList(module)
     else:
         module.fail_json(msg='Module apt_repository supports only Debian and Ubuntu.')
 
@@ -462,7 +463,7 @@ def main():
 
     if not module.check_mode and changed:
         try:
-            sourceslist.save(module)
+            sourceslist.save()
             if update_cache:
                 cache = apt.Cache()
                 cache.update()