[SSSD] [sssd PR#822][comment] tests: fix enctypes in test_copy_keytab

[jhrozek]

URL: https://github.com/SSSD/sssd/pull/822
Title: #822: tests: fix enctypes in test_copy_keytab

jhrozek commented:
"""
* master:
 * 452c4f6c057b6c3891f88913b86226b7f88200e4
 * 188a879bc370c02ed5c23ea1c11485bbe93ae8b3
* sssd-1-16:
 * 9b8c66d53d2c44162b199f083d40a72cb5cffa3f
 * 3a92a87d4240b7f268c33ed9d7d96b3efb4d92dd
"""

See the full comment at https://github.com/SSSD/sssd/pull/822#issuecomment-500751242