The `--log-level` option when running the agent sub-command for vminitd
was being silently ignored cause of the way the agent is being run. As a
workaround we need to read `/proc/self/cmdline` to get the right args
Update containerization dependency in ctr-example to the latest tag of
containerization. Additionally make README for ctr-example more clear.
Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>