BVT

Update to latest Rust edition and tidy up #47

	name: BVT
	on: [pull_request]
	jobs:
	bvt:
	name: BVT
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: install dependencies
	run: \|
	rustup target add x86_64-unknown-linux-musl
	rustup component add rustfmt clippy
	- name: Format Check
	run: make fmt
	- name: Clippy Check
	run: make clippy
	- name: Build
	run: make vsock
	- name: Build echo_server
	run: make echo_server

	## Unfortunately GitHub Acions doesn't support nested virtualization at the moment,
	## And the vsock have bugs on qemu + tcg, so we can't run the unit test for now.
	# - name: Install QEMU
	# run: \|
	# sudo apt-get install qemu-system-x86 -y
	# sudo modprobe vhost_vsock
	# - name: Run Unit Test
	# run: \|
	# make vm-for-action
	# make check

Provide feedback