Add PyDateTime_IMPORT to module initialization function.

[aebruno]

Was experiencing segfaults when accessing datetime fields on the
PyKAdminPrincipalObject, for example, calls to function
PyKAdminPrincipal_get_expire(..) resulted in a segfault.

Example code resulting in segfault:

import kadmin

kadm = kadmin.init_with_keytab("user@example.com", "/path/to/keytab")
princ = kadm.get_principal("user@example.com")
print princ.expire

However, if imported datetime module first, all is well:

import kadmin
import datetime

kadm = kadmin.init_with_keytab("user@example.com", "/path/to/keytab")
princ = kadm.get_principal("user@example.com")
print princ.expire

This suggested datetime wasn't being initialized properly? Adding this
patch to ensure Py_DateTime is initialized as part of the module
initialization fixed the segfaults.

[rjancewicz]

It would appear that you have forked from a much older branch. Please rebase off the current master and try the test again. I am unable to reproduce the error.

[aebruno]

Thanks, looks like your recent commit 5e7e39f fixed my issue (not sure if it's related). I could reproduce this on ac95fa9 (which is where I forked from). Thanks for your work on this library! Feel free to close this out.