This pull request adds an enhancement to the internal Bundler class
to cache solution sets. This prevents Vagrant from generating a
solution for configured plugins on every run. Modifications to
the configured plugin list (global or local) will result in the
cached solution being invalidatd and resolved again.
Also included is the removal of the GEMRC modifications required
for Windows.
Due to the Vagrantfile being loaded prior to plugin loading to determine
project local plugin information the Vagrant.has_plugin? helper will always
return false when the Vagrantfile is first loaded. To prevent this behavior
we can check for plugins in the plugin data files prior to the plugins
being loaded, and after they have been loaded we can fallback to the
original specification based check.
This commit attempts to uniquely identify the temporary files and
directories that are created during test runs. Where it was a quick
fix, this commit also removes the temporary files and directories.
There are still a ton of temporary files due to calls to
.isolated_environment in the tests without an easy API an easy way
to provide a closer to that function.
