Always copy dockerinit locally, regardless of whether our docker binary is static, because even it might get deleted or moved/renamed
Add dockerinit SHA1 and path to "docker info" when debug mode is enabled
Allow packagers to specify a custom dockerinit lookup location via DOCKER_INITPATH in dynbinary

Only necessary if distro policy dictates that the path deviate from the paths already listed in utils/utils.go - please refrain from using it otherwise.
Merge pull request #3064 from tianon/custom-dockerinit-path

Allow custom dockerinit path