[issue22111] Improve imaplib testsuite.

[Milan Oberkirch]

Milan Oberkirch added the comment:

AntoinePitrou: Thanks for the review!
I made the suggested changes and could not resist refactoring the hole thing (since I plan to spend some time on that file I wanted it to be readable and pep conform).

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Added file: http://bugs.python.org/file36178/imaplib_testV2.patch

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<http://bugs.python.org/issue22111>
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