[PYTHON-CRYPTO] Add ANS1_UTCTIME.get_datetime function

[Pavel Shramov]

OpenSSL ASN1_UTCTIME_print (and other time printing functions) produce
output not suitable for parsing with strptime:
 * Month name are not locale-dependant so python strptime fail to
   recognize them (e.g. in gtk applications)
 * Timezone is either missing or ' GMT' (with space)

Proposed patch adds get_datetime function that returns python
datetime.datetime structure with correct timezone. If this function
looks suitable I'll add tests.
                Pavel

P.S. Error messages are not perfect so they must be changed.
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