core: better logging around locks
providers/virtualbox: no SSH info if not running
providers/docker: docker-run command starting points
core: Fix bug where if outputting empty string, would output nothing
providers/docker: stream data for run
providers/docker: fix some extranneous newlines in streamed output
providers/docker: run_command doesn't need to actual setup host machine
providers/docker: expose ports
Merge pull request #3560 from mitchellh/f-docker-run

docker-run command
whitespace
providers/docker: don't show cmd if one is not specified
providers/docker: can docker-run non-existent containers
providers/docker: cleaner reload
providers/docker: destroy built image on up
providers/docker: be more lenient about deleting built image
providers/docker: expand path to share relative to docker env
synced_folders/rsync: fix oddness on Windows
commands/init: force flag [GH-3564]
[ci skip] Fix a typo in bin/vagrant comment.
Merge pull request #3572 from JuanitoFatas/patch/fix-a-typo

[ci skip] Fix a typo in bin/vagrant comment.