order and fio tests

 1. removed all generated files from repo
 1. updated .gitignore accordingly
 1. added `QEMU/x86_64-softmmu/run3.sh` for easier running:
  1.  change pwd if needed
  1. mount and create rd/ssd.img if needed
  1. removed dat files if needed (ssd.conf is newer)
  1. loads the QEMU with os image defined in `os_img_path.conf` and -redir tcp:2222::22.
 1. add fio tests for testing storage performance and integrity, see `eVSSIM/fio_tests/README.md`