providers/virtualbox: set proper mac address on priv net [GH-3588]
Move Windows symlink re-establishment after reboot into capability

This reduces the complexity and likelihood of provisioner bugs.
Added test to verify Windows symlinks to shares are fixed
Merge pull request #3592 from mitchellh/reboot-capability-should-fix-symlinks

guests/windows: reboot capability should fix symlinks
website/docs: docker provider
website/docs: docker commands
website/docs: rdp command
website/docs: post_up_message
website/docs: force flags on init and box remove
website/docs: run once and always provisioners
Default the WinRM shell provisioner to privileged (elevated)
Fix remote/downloaded shell scripts

The temporary shell script that we downloaded the script too was being deleted twice, thus causing an error on the secondary delete.
Merge pull request #3593 from mitchellh/elevated-winrm-shell-provisioner

provisioner/shell: Elevated winrm shell provisioner
website/docs: global-status
fix "necessarilly" typo
fixed typos found by topy in all Markdown files

Topy is available at https://github.com/intgr/topy.
Updated website documentation for graceful_halt_timeout

The default value in the code is actually 60 seconds, so now the docs match that.
Removed unused halt timeout and check interval settings.
Merge pull request #3598 from mitchellh/remove-halt-timeout-from-windows-guest

guests/windows: Removed unused halt timeout and check interval settings.
Merge pull request #3597 from mitchellh/update-website-docs-halt-timeout-default-value

website/docs: Updated website documentation for graceful_halt_timeout