We are replacing most of our bash tools with python versions so we
can support cross-platform development.
To facilitate writing shell-like scripts in Python, this CL adds
a common.py file to share common utilities. It curretly contains
tools to simplify shell-like command execution and argument parsing.
BUG=b:218559770
TEST=./tools/clippy && ./tools/fmt && ./tools/impl/common.py
Change-Id: I7f8b3523394973ed5c741b926fdc41e52133189f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3461240
Reviewed-by: Maciek Swiech <drmasquatch@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Dennis Kempin <denniskempin@google.com>
