Add revert_recipe function

And adjust the tests to use it so that it covers both revert_recipe and
revert_file.

src/pylorax/api/recipes.py

@@ -379,6 +379,23 @@ def delete_file(repo, branch, filename):
     message = "Recipe %s deleted" % filename
     return repo.create_commit(ref, sig, sig, "UTF-8", message, tree, [parent_commit])
 
+def revert_recipe(repo, branch, recipe_name, commit):
+    """Revert the contents of a recipe to that of a previous commit
+
+    :param repo: Open repository
+    :type repo: Git.Repository
+    :param branch: Branch name
+    :type branch: str
+    :param recipe_name: Recipe name to revert
+    :type recipe_name: str
+    :param commit: Commit hash
+    :type commit: str
+    :returns: OId of the new commit
+    :rtype: Git.OId
+    :raises: Can raise errors from Ggit
+    """
+    return revert_file(repo, branch, recipe_filename(recipe_name), commit)
+
 def revert_file(repo, branch, filename, commit):
     """Revert the contents of a file to that of a previous commit
 

tests/pylorax/test_recipes.py

@@ -184,7 +184,7 @@ class GitRecipesTest(unittest.TestCase):
         """Test reverting a file on a branch"""
         commits = recipes.list_commits(self.repo, "master", "http-server.toml")
         revert_to = commits[0].commit
-        oid = recipes.revert_file(self.repo, "master", "http-server.toml", revert_to)
+        oid = recipes.revert_recipe(self.repo, "master", "http-server", revert_to)
         self.assertNotEqual(oid, None)
 
         commits = recipes.list_commits(self.repo, "master", "http-server.toml")