Add kernel option into preseed

According to suggestion, add the kernel option in the preseed file,
leave it empty to get the lastest kernel, or specify the kernel
number.

Change-Id: Ie5b8f62a89ef9eb51954f0452becbaa9e81ee973

multi-node-aio/README.rst

@@ -145,6 +145,8 @@ Instruct the system to run the OSA playbooks, if you want to deploy other OSA po
 Instruct the VM to use the selected image, eg. ubuntu xenial:
   ``DEFAULT_IMAGE=${DEFAULT_IMAGE:-16.04}``
 
+Install the specified kernel, eg 3.13.0-34 if you want to deploy Juno release.
+  ``DEFAULT_KERNEL=${DEFAULT_KERNEL:-3.13.0-34}``
 
 Re-kicking the VMs
 ------------------

multi-node-aio/setup-cobbler.sh

@@ -20,6 +20,15 @@ source functions.rc
 # The default image for VMs, change it to 16.04 if you want to use xenial as operation system.
 DEFAULT_IMAGE="${DEFAULT_IMAGE:-"$(lsb_release -sd | awk '{print $2}')"}"
 
+# The default kernel for Image, leave it empty will install the lastest kernel.
+DEFAULT_KERNEL="${DEFAULT_KERNEL:-}"
+
+if [ -z "$DEFAULT_KERNEL" ]; then
+  DEFAULT_KERNEL=linux-image-generic
+else
+  DEFAULT_KERNEL="linux-image-$DEFAULT_KERNEL-generic"
+fi
+
 # Install cobbler
 wget -qO - http://download.opensuse.org/repositories/home:/libertas-ict:/cobbler26/xUbuntu_14.04/Release.key | apt-key add -
 add-apt-repository "deb http://download.opensuse.org/repositories/home:/libertas-ict:/cobbler26/xUbuntu_14.04/ ./"
@@ -83,6 +92,7 @@ for seed_file in $(ls -1 templates/pre-seeds); do
   sed -i "s|__DEVICE_NAME__|${DEVICE_NAME}|g" "/var/lib/cobbler/kickstarts/${seed_file#*'/'}"
   sed -i "s|__SSHKEY__|${SSHKEY}|g" "/var/lib/cobbler/kickstarts/${seed_file#*'/'}"
   sed -i "s|__DEFAULT_NETWORK__|${DEFAULT_NETWORK}|g" "/var/lib/cobbler/kickstarts/${seed_file#*'/'}"
+  sed -i "s|__DEFAULT_KERNEL__|${DEFAULT_KERNEL}|g" "/var/lib/cobbler/kickstarts/${seed_file#*'/'}"
 done
 
 # Restart services again and configure autostart

multi-node-aio/templates/pre-seeds/ubuntu-server-14.04-unattended-cobbler-cinder.seed

@@ -22,6 +22,9 @@
 # Note: options passed to the installer will be added automatically.
 d-i debian-installer/add-kernel-opts string $kernel_options_post
 
+### Base system installation
+d-i base-installer/kernel/image string __DEFAULT_KERNEL__
+
 #############
 #
 # Networking

multi-node-aio/templates/pre-seeds/ubuntu-server-14.04-unattended-cobbler-infra.seed

@@ -22,6 +22,9 @@
 # Note: options passed to the installer will be added automatically.
 d-i debian-installer/add-kernel-opts string $kernel_options_post
 
+### Base system installation
+d-i base-installer/kernel/image string __DEFAULT_KERNEL__
+
 #############
 #
 # Networking

multi-node-aio/templates/pre-seeds/ubuntu-server-14.04-unattended-cobbler-logging.seed

@@ -22,6 +22,9 @@
 # Note: options passed to the installer will be added automatically.
 d-i debian-installer/add-kernel-opts string $kernel_options_post
 
+### Base system installation
+d-i base-installer/kernel/image string __DEFAULT_KERNEL__
+
 #############
 #
 # Networking

multi-node-aio/templates/pre-seeds/ubuntu-server-14.04-unattended-cobbler-network.seed

@@ -22,6 +22,9 @@
 # Note: options passed to the installer will be added automatically.
 d-i debian-installer/add-kernel-opts string $kernel_options_post
 
+### Base system installation
+d-i base-installer/kernel/image string __DEFAULT_KERNEL__
+
 #############
 #
 # Networking

multi-node-aio/templates/pre-seeds/ubuntu-server-14.04-unattended-cobbler-nova_compute.seed

@@ -22,6 +22,9 @@
 # Note: options passed to the installer will be added automatically.
 d-i debian-installer/add-kernel-opts string $kernel_options_post
 
+### Base system installation
+d-i base-installer/kernel/image string __DEFAULT_KERNEL__
+
 #############
 #
 # Networking

multi-node-aio/templates/pre-seeds/ubuntu-server-14.04-unattended-cobbler-swift.seed

@@ -22,6 +22,9 @@
 # Note: options passed to the installer will be added automatically.
 d-i debian-installer/add-kernel-opts string $kernel_options_post
 
+### Base system installation
+d-i base-installer/kernel/image string __DEFAULT_KERNEL__
+
 #############
 #
 # Networking