Better error message on access to non-existing attribute

I believe column access via `__getattr__` is bad and shouldn't be implicitly encouraged by the error message when accessing a non-existing attribute on DataFrame. This patch changes the error message from 'no such column'  to the more generic 'no such attribute', which is also what Pandas DFs will throw.

Author: ksonj <kson@siberie.de>

Closes #5771 from ksonj/master and squashes the following commits:

bcc2220 [ksonj] Better error message on access to non-existing attribute

python/pyspark/sql/dataframe.py

@@ -633,7 +633,8 @@ class DataFrame(object):
         [Row(age=2), Row(age=5)]
         """
         if name not in self.columns:
-            raise AttributeError("No such column: %s" % name)
+            raise AttributeError(
+                "'%s' object has no attribute '%s'" % (self.__class__.__name__, name))
         jc = self._jdf.apply(name)
         return Column(jc)