switch to vndr

vndr is almost exactly the same as our old good hack/vendor.sh. Except
it's cleaner and it allows to re-vendor just one dependency if needed
(which we do a lot for containers/image).

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

vendor/github.com/mistifyio/go-zfs/Vagrantfile

@@ -1,34 +0,0 @@
-
-VAGRANTFILE_API_VERSION = "2"
-
-Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
-    config.vm.box = "ubuntu/trusty64"
-	config.ssh.forward_agent = true
-
-	config.vm.synced_folder ".", "/home/vagrant/go/src/github.com/mistifyio/go-zfs", create: true
-
-    config.vm.provision "shell", inline: <<EOF
-cat << END > /etc/profile.d/go.sh
-export GOPATH=\\$HOME/go
-export PATH=\\$GOPATH/bin:/usr/local/go/bin:\\$PATH
-END
-
-chown -R vagrant /home/vagrant/go
-
-apt-get update
-apt-get install -y software-properties-common curl
-apt-add-repository --yes ppa:zfs-native/stable
-apt-get update
-apt-get install -y ubuntu-zfs
-
-cd /home/vagrant
-curl -z go1.3.3.linux-amd64.tar.gz -L -O https://storage.googleapis.com/golang/go1.3.3.linux-amd64.tar.gz
-tar -C /usr/local -zxf /home/vagrant/go1.3.3.linux-amd64.tar.gz
-
-cat << END > /etc/sudoers.d/go
-Defaults env_keep += "GOPATH"
-END
-
-EOF
-
-end