adjusted default certificate paths
    
    Since Fedora 19, update-ca-trust script is used to regenerate
    certificates used in validation for ssl connections. Directories like
    /etc/ssl/certs do not contain symlinks named with hashes of certificates
    they point to. One file containing bundled ca certificates is used
    instead.
    
    ssl_verify_host patch has been tweaked a bit, so that pywbem correctly
    finds the right place with ca certifiactes - either single file on f19+
    or a directory on older distributions.