Fix indentation to be a multiple of 4

lib/ansible/playbook/attribute.py

@@ -23,13 +23,13 @@ class Attribute:
 
     def __init__(self, isa=None, private=False, default=None, required=False, listof=None, priority=0, always_post_validate=False):
 
-       self.isa = isa
-       self.private = private
-       self.default = default
-       self.required = required
-       self.listof = listof
-       self.priority = priority
-       self.always_post_validate = always_post_validate
+        self.isa = isa
+        self.private = private
+        self.default = default
+        self.required = required
+        self.listof = listof
+        self.priority = priority
+        self.always_post_validate = always_post_validate
 
     def __cmp__(self, other):
        return cmp(other.priority, self.priority)