2to3-getcwdu-to-metaclass

Run 2to3 fixers `getcwdu` to `metaclass`. Most made no changes, of those that did, all but map failed for some tests. I think most of the map uses could be replace by list comprehension.
```
passed
----------
getcwdu
has_key  -- already done
input
intern
isinstance
itertools_imports -- none to remove, they are in idioms?
map
metaclass

fail
----
idioms
itertools
long

skipped
-----------
import
imports
import2
```