ipatests: add missing classes from test_installation in nightly runs
    
    The following test classes were missing in all nightly definitions:
    * TestADTrustInstall
    * TestADTrustInstallWithDNS_KRA_ADTrust
    * TestKRAinstallAfterCertRenew
    
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>