virt-driver-vz: Require parallels-7.0.22 at least
    
    With the latest patch to the vz driver (7d73ca06cefe) I was
    getting some compilation errors. It turned out, my installation
    of the parallels SDK was not as fresh as it could be. Parallels
    installed in my system were missing the
    PRL_USE_VNET_NAME_FOR_BRIDGE_NAME symbol which simply was not
    introduced at the time I was installing the SDK. The symbol was
    introduced in 86e62a5d which was then part of the 7.0.22 release.
    Require that version at least therefore.
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>