parallels: get domain info with SDK
    
    Obtain information about domains using parallels sdk instead of prlctl.
    prlsdkLoadDomains functions behaves as former parallelsLoadDomains with
    NULL as second parameter (name) - it fills parallelsConn.domains list.
    
    prlsdkLoadDomain is now able to update specified domain by given
    virDomainObjPtr.
    
    Signed-off-by: Dmitry Guryanov <dguryanov@parallels.com>