This sets the `authenticate_box_url` hook as deprecated and also
disables the cloud auth middleware from adding an access token
as a URL parameter by default. An environment variable has been
added which can be used for re-enabling the access token URL
parameter behavior if required for some legacy system which does
not support the authorization header.
Prior to this commit, the AddAuthentication hooks still existed in a
deprecated class LoginCommand. This commit fixes that by moving it over
to the vagrant cloud cli namespace instead.
