[offlineimap] chg: added a full stack of all thread dump upon EXIT or KILL signal (#271)

[Nicolas Sebrecht]

Applied. Did some minor changes:
- missing parenthesis for print
- commit must be in imperative form, subject has no final dot.

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https://github.com/OfflineIMAP/offlineimap/pull/271#issuecomment-154910886
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