* gnu/packages/virtualization.scm (vagrant): New variable.
* gnu/packages/patches/vagrant-Support-system-installed-plugins.patch,
gnu/packages/patches/vagrant-Use-a-private-temporary-dir.patch
gnu/packages/patches/vagrant-bin-vagrant-silence-warning-about-installer.patch:
New files.
* gnu/local.mk(dist_patch_DATA): Add them
