parallels: rewrite parallelsApplyConfig with SDK
    
    Rewrite code, which applies domain configuration given
    to virDomainDefineXML function to the VM of container
    registered in PCS.
    
    This code first check if there are unsupported parameters
    in domain XML and if yes - reports error. Some of such
    parameters are not supported by PCS, for some - it's not
    obvious, how to convert them into PCS's corresponding params,
    so let's put off it, and implement only basic params in
    this patch.
    
    Signed-off-by: Dmitry Guryanov <dguryanov@parallels.com>