Many of these patches have been merged into Vagrant, but are not yet released. To patch the distributed version to avoid noise from the source builds of Vagrant, apply the patches via the following (assuming OS X with Vagrant 1.9.5 installed from the binary distribution, including via Homebrew Cask):
$ cd /opt/vagrant/embedded/gems/gems/vagrant-1.9.5
$ curl -L https://gist.githubusercontent.com/jen20/b3e26ee869f546347680e7aa47a41718/raw/86e6f45fba022c5f8338232f87bc5b5417895d8c/vagrant-smartos.patch | \
sudo patch -p1