[Libguestfs] windows v2v related patches

1. The first (0003) is a patch I already sent it disables all vmware tools on the windows guest. 2. The next one (0005) is a refactoring of the code to prevent downloading the registry hive multiple times. 3. (0006) removes vmware run entries in the software hive. 4. (0007) disable the parallel port driver. 5. (0008) is reverting some of the changes in patch (0003), I'll explain that one a bit: I tested the v2v conversion and found that in the first run windows plug and play doesn't find the old keyboard and as a result it turns off the i8042prt service that is responsible for the keyboard. This means no keyboard for VNC users (rdesktop users have a different keyboard mechanism that does continue to work). As a result of this test, I thought that because the only service that really must be disabled is the tool service (the one that fails to start and create the ugly message) We better be as little intrusive as possible and disable the minimal set. Amos.