The /.dockerenv file is now a marshalled json array so that environment
variables with \n and other weird values are supported.
Upstream-commit: 1c3a674444c6a6f08ea5ce3812046a00678e4a29
Component: engine
This allows docker-init to not import the main docker
module, which means it won't e.g. pick up any sqlite
dependencies.
Upstream-commit: db999667245926569b161747eed7e08b2ec1c34c
Component: engine