Backport patch 1.57 to 2.1.2. Apparently ftp servers that send 227

Backport patch 1.57 to 2.1.2.  Apparently ftp servers that send 227
responses that the original parse227() routine can't handle are
becoming more common.

"""
Change the 227 response parser to use a more liberal regular
expression.  This is needed for certain servers that (in violation of
the standard) don't return the parentheses in the response.

This fixes SF bug #441712 by Henrik Weber (not exactly using his
patch).
"""