ipatests: TestIpaHealthCheck now needs 1 client
    
    The test TestIpaHealthCheck has been updated with commit
    e86ff48 and now needs 1 master, 1 replica and 1 client
    in order to execute.
    Update the nightly definitions accordingly.
    
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>