test_krbtpolicy: skip SPAKE-related tests in FIPS mode
    
    SPAKE is based on the crypto primitives which are not FIPS compliant
    yet. This means that in FIPS mode use of 'hardened' authentication
    indicator is not possible. Skip corresponding tests in FIPS mode.
    
    Related: https://pagure.io/freeipa/issue/9119
    
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Francisco Trivino <ftrivino@redhat.com>