5ff41fa test_ipagetkeytab: fix missing import

Authored and Committed by jcholast 8 years ago
    test_ipagetkeytab: fix missing import
    
    The import was accidentally removed in commit
    9a3d5fdadd691df722b4a2ee29642a81a0035ad3.
    
    https://fedorahosted.org/freeipa/ticket/5638