This commit updates the behavior of printing the checkpoint version
check for Vagrant. To allow users to filter out the message, it updates
the version check to go to stderr. It updates the UI class for printing
the version check to be a "basic" class, so that the message continues
to be the same color instead of a red error message.
The checkpoint update missed the environment variable check for
disabling the checks so this adds in the check and properly
disables checks when requested.
