Add SELinux module checking to hsm_validator
    
    Don't blow up if the expected module is not installed but warn
    about it. Hopefully users will actually read the output and/or the
    installation log.
    
    This is done by looking for strings in the path. Not great but
    it's at least something.
    
    Related: https://pagure.io/freeipa/issue/9273
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>