[CA-127357] Fix upgrade from XS 5.5 tools to standard tools

5.5 (George) tools have a different driver name which we must
check for and accept

5.5 tools can require interaction on silent uninstalls, so we
have to upgrade to latest legacy tools and uninstall them instead

Signed-off-by: Ben Chalmers <Ben.Chalmers@citrix.com>