imaplib fails to connect to IMAP4REV2 server

[kr-g]

imaplib fails to connect to IMAP4REV2 server

by changing here

cpython/Lib/imaplib.py

Line 44 in 1795d6c

AllowedVersions = ('IMAP4REV1', 'IMAP4') # Most recent first

to the following

AllowedVersions = ('IMAP4REV2','IMAP4REV1', 'IMAP4') # Most recent first

the test cases are able to run against an imap server advertising rev2

remark:
using this together with unittest