virtcontainers: move oci, uuid packages top level

This will be useful at runtime level; no need for oci or uuid to be subpkg of
virtcontainers.

While at it, ensure we run gofmt on the changed files.

Signed-off-by: Eric Ernst <eric_ernst@apple.com>

src/runtime/cmd/kata-runtime/kata-check_generic_test.go

@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+//go:build arm64 || ppc64le
 // +build arm64 ppc64le
 
 package main