install: Run all validators at once.

Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipapython/install/core.py

@@ -118,16 +118,6 @@ class KnobBase(PropertyBase):
     def __init__(self, outer):
         self.outer = outer
 
-    def __set__(self, obj, value):
-        try:
-            self.validate(value)
-        except KnobValueError:
-            raise
-        except ValueError as e:
-            raise KnobValueError(self.__outer_name__, str(e))
-
-        super(KnobBase, self).__set__(obj, value)
-
     def validate(self, value):
         pass
 
@@ -253,8 +243,25 @@ class Configurable(six.with_metaclass(abc.ABCMeta, object)):
             except KeyError:
                 pass
             else:
-                prop = prop_cls(self)
+                setattr(self, name, value)
-                prop.__set__(self, value)
+
+        for owner_cls, name in cls.knobs():
+            if name.startswith('_'):
+                continue
+            if not isinstance(self, owner_cls):
+                continue
+            value = getattr(self, name, None)
+            if value is None:
+                continue
+
+            prop_cls = getattr(owner_cls, name)
+            prop = prop_cls(self)
+            try:
+                prop.validate(value)
+            except KnobValueError:
+                raise
+            except ValueError as e:
+                raise KnobValueError(name, str(e))
 
         if kwargs:
             extra = sorted(kwargs)