Vagrant 2.2.8

What's new in this version:

Features:
- virtualbox/disks: Add ability to manage virtual disks for guests

Improvements:
- bin/vagrant: Automatically include global options within commands
- bin/vagrant: Suppress Ruby warnings when not running pre-release version
- communicator/ssh: Add support for configuring SSH connect timeout
- core: Update childprocess gem
- core: Add cli option --no-tty
- core: Overhaul call stack modifications implementation for hooks and triggers
- core/bundler: Cache plugin solution sets to speed up startup times
- config/vm: Addbox_download_options config to specify extra download options for a box
- guest/alpine: Add ansible provisioner guest support
- guest/linux: Update systemd? check to use sudo
- guest/linux: Use systemd if available to halt and reboot system
- guests/linux: Mount smb folders with mfsymlinks option by default
- guest/redhat: Add support for SMB
- guest/windows: Rescue all regular exceptions during reboot wait
- providers/docker: Support catching container name when using podman
- provisioners/docker: Support Centos8
- provisioners/podman: Add Podman as a provisioner
- provisioners/salt: Allow specifying python_version

Bug fixes:
- communicators/winssh: Fix issues with Windows SSH communicator
- core/bundler: Activate vagrant specification when not active
- core/bundler: Properly resolve sets when Vagrant is in prerelease
- core/downloader: Always set -q flag as first option
- core/hooks: Update dynamic action hook implementation to prevent looping
- core/synced_folders: Validate type option if set
- guests/debian: Choose netplan renderer based on network configuration and installed tools
- host/darwin: Quote directories in /etc/exports
- host/linux: Ensure /etc/exports does not contain duplicate records
- host/windows: Check all interfaces for port conflict when host_ip: "0.0.0.0"
- providers/docker: Fix issue where Vagrant fails to remove image if it is in use
- providers/docker: Fix issue with getting correct docker image id from build output
- providers/hyperv: Prevent error when identity reference cannot be translated
- provider/hyperv: Use service id for manipulating vm integration services
- providers/virtualbox: Parse list dhcpservers output on VirtualBox 6.1
- providers/virtualbox: Raise an error if guest IP ends in .1
- provisioners/shell: Ensure windows shell provisioners always get an extension
- util/io: Fix encoding conversion errors