Move plain.sh provisioner to a shared folder

test-vm-providers/plain.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/zsh
+
+echo 'source /vagrant_data/powerlevel9k.zsh-theme' > ~/.zshrc

test-vm/Vagrantfile

@@ -16,7 +16,7 @@ Vagrant.configure(2) do |config|
 
   # Bootstrap
   config.vm.provision :shell, path: "bootstrap.sh", privileged: false
-  config.vm.provision :shell, path: "plain.sh", privileged: false
+  config.vm.provision :shell, path: "../test-vm-providers/plain.sh", privileged: false
   config.vm.provision :shell, path: "antigen.sh"
   config.vm.provision :shell, path: "prezto.sh"
   config.vm.provision :shell, path: "omz.sh"

test-vm/plain.sh

@@ -1,3 +0,0 @@
-#!/usr/bin/zsh
-
-echo 'source /vagrant_data/powerlevel9k.zsh-theme' > ~/.zshrc