Set all VMs to not auto-update the tools.

The current version of the plugin is behaving weirdly.

(cherry picked from commit 2e74c462df)

vagrant/centos-7/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/debian-8/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/debian-9/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/fedora-26/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/fedora-27/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/ubuntu-14.04/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/ubuntu-16.04/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end

vagrant/ubuntu-18.04/Vagrantfile

@@ -21,4 +21,8 @@ Vagrant.configure("2") do |config|
   # And share a folder with the build script
   config.vm.synced_folder "../scripts", "/home/vagrant/scripts"
 
+  # set auto_update to false, if you do NOT want to check the correct 
+  # additions version when booting this machine
+  config.vbguest.auto_update = false
+
 end