[x86] Add Xvisor-x86_64 setup automation scripts

The following scripts are added:
1. Create HDD for keeping guest binaries (emulated by QEMU as IDE)
2. Partition layout.
3. Guest initialization command set.
4. lomount source to mount HDD paritions.
5. Script to create complete ready-to-run setup.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>