no fixer  for itertools.imap|izip|ifilter

http://python-future.org/compatible_idioms.html#map recommends using something like `from builtins import map` instead of `itertools.imap` but there is no fixer to do it automatically.

Note modernize has a similar transformation that could be adapted https://github.com/python-modernize/python-modernize/blob/master/libmodernize/fixes/fix_itertools_imports_six.py