When a request to check an outdated box (or update a box), add explicit
architecture compatibility check in addition to ensuring the version is
newer than before.
The architecture compatibility checks allow boxes that were marked as an
"unknown" architecture to see new "unknown" architectures as viable
update options, if an architecture specific provider is not available.
In the scenario that the existing version/provider has an explicit
architecture defined, a new version/provider with an "unknown"
architecture is not considered compatible.
This architecture check can be bypassed by explicitly setting
`config.vm.box_architecture = nil` in the Vagrantfile.
This includes updates for resolving all warnings provided by Ruby
for deprecations and/or removed methods. It also enables support
for Ruby 2.7 in the specification constraint as all 2.7 related
warnings are resolved with this changeset.
Prior to this commit, if a user had recently checked for updates, there
was no way to force Vagrant to re-check without manually deleting a
state file in the local `.vagrant` data dir. This commit fixes that by
giving users the ability to force check for updates for a given box with
a flag to the `vagrant box outdated` command.
This commit changes the behavior of `vagrant box outdated --global` so
it gets the latest version for the current machine's provider, rather
than the latest version for any provider.
