removed shutdown_command from all examples

examples/centos/centos8-example.pkr.hcl

@@ -61,7 +61,6 @@ source "xenserver-iso" "example" {
   ssh_username     = "root" # The ssh user packer uses to connect to the VM
   ssh_password     = "centos" # The ssh password packer uses to connect to the VM
   ssh_wait_timeout = "10m" # consider install failed if unable to connect via ssh 10m into the build
-  shutdown_command = "/sbin/shutdown" #  After connection via ssh issue this command to shut down the vm
   #
   # What to do with the resulting VM
   #

examples/centos/centos8-local.pkr.hcl

@@ -71,7 +71,6 @@ source "xenserver-iso" "centos8-local" {
   ssh_username     = "root"
   ssh_password     = "centos"
   ssh_wait_timeout = "10000s"
-  shutdown_command = "/sbin/shutdown"
 
   output_directory = "packer-centos8-local"
   keep_vm          = "always"

examples/centos/centos8-netinstall.pkr.hcl

@@ -71,7 +71,6 @@ source "xenserver-iso" "centos8-netinstall" {
   ssh_username     = "root"
   ssh_password     = "centos"
   ssh_wait_timeout = "10000s"
-  shutdown_command = "/sbin/shutdown"
 
   output_directory = "packer-centos8-netinstall"
   keep_vm          = "always"

examples/ubuntu/ubuntu-2004.pkr.hcl

@@ -75,7 +75,6 @@ source "xenserver-iso" "ubuntu-2004" {
   ssh_username     = "testuser"
   ssh_password     = "ubuntu"
   ssh_wait_timeout = "10m"
-  shutdown_command = "/sbin/shutdown"
 
   output_directory = "packer-ubuntu-2004-iso"
   keep_vm          = "always"