Modifies Ubuntu 18.04 task to enable node registration.

* Modifies stages to get the ubuntu 18.04 nodes
to register.
* Changes startup method after first boot to use cron.

fix for PR based on comments

tasks/ubuntu/bionic.task/os_complete.erb

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+echo Razor policy successfully applied > /tmp/razor_complete.log
+echo Installed using <%= task.label %> - <%= task.description %> >> /tmp/razor_complete.log
+echo Repo: <%= repo_url %> >> /tmp/razor_complete.log
+echo Node: <%= node_url %> >> /tmp/razor_complete.log
+
+sed -i '/razor_postinstall/d' /etc/crontab
+
+curl -s <%= broker_install_url %> | bash
+if [ $? -ne 0 ]; then
+    echo "Broker run failed; see /var/log/razor.log for more details" >> /tmp/razor_complete.log
+else
+    echo Ran '<%= broker_install_url %>' >> /tmp/razor_complete.log
+fi

tasks/ubuntu/bionic.task/preseed.erb

@@ -0,0 +1,56 @@
+d-i console-setup/ask_detect boolean false
+d-i keyboard-configuration/layoutcode string us
+d-i netcfg/choose_interface select auto
+d-i netcfg/get_hostname string <%= node.metadata['hostname'] || node.hostname %>
+d-i netcfg/get_domain string <%= (node.metadata['hostname'] || node.hostname).split('.').drop(1).join('.') %>
+d-i netcfg/no_default_route boolean true
+# This is introduced in Trusty.
+d-i live-installer/net-image string <%= repo_url("install/filesystem.squashfs") %>
+d-i mirror/protocol string <%= repo_uri.scheme %>
+d-i mirror/country string manual
+d-i mirror/http/hostname string <%= "#{repo_uri.host}:#{repo_uri.port}" %>
+d-i mirror/http/directory string <%= repo_uri.path %>
+d-i clock-setup/utc boolean true
+d-i time/zone string <%= node.metadata['timezone'] || 'US/Pacific' %>
+d-i clock-setup/ntp boolean true
+d-i clock-setup/ntp-server string ntp.ubuntu.com
+d-i partman-auto/disk string /dev/sda
+d-i partman-auto/method string lvm
+d-i partman-lvm/device_remove_lvm boolean true
+d-i partman-md/device_remove_md boolean true
+d-i partman-auto-lvm/guided_size string max
+d-i partman-auto/choose_recipe select atomic
+d-i partman-auto/purge_lvm_from_device boolean true
+d-i partman/default_filesystem string ext4
+d-i partman-auto/init_automatically_partition select biggest_free
+d-i partman-lvm/confirm boolean true
+d-i partman-lvm/confirm_nooverwrite boolean true
+d-i partman-partitioning/confirm_write_new_label boolean true
+d-i partman/choose_partition select finish
+d-i partman/confirm boolean true
+d-i partman/confirm_nooverwrite boolean true
+d-i partman-md/confirm boolean true
+d-i passwd/root-login boolean true
+d-i passwd/make-user boolean true
+d-i passwd/root-password password <%= node.metadata['root_password'] || node.root_password %>
+d-i passwd/root-password-again password <%= node.metadata['root_password'] || node.root_password %>
+d-i passwd/user-fullname string Ubuntu User
+d-i passwd/username string ubuntu
+d-i passwd/user-password password insecure
+d-i passwd/user-password-again password insecure
+d-i user-setup/allow-password-weak boolean true
+d-i apt-setup/restricted boolean true
+d-i pkgsel/include string curl openssh-server
+d-i grub-installer/only_debian boolean true
+d-i grub-installer/with_other_os boolean true
+d-i finish-install/reboot_in_progress note
+# Uncomment this for `nomodeset`.
+# d-i debian-installer/add-kernel-opts string nomodeset
+# Our callbacks
+d-i preseed/early_command string wget <%= log_url("preseed start") %>
+d-i preseed/late_command string  wget <%= log_url("preseed end") %>; \
+wget <%= file_url("os_boot") %> -O /target/usr/local/sbin/razor_postinstall.sh;  \
+printf %b '@reboot root (sleep 90; /bin/bash /usr/local/sbin/razor_postinstall.sh)\n' >> /target/etc/crontab; \
+chmod +x /target/usr/local/sbin/razor_postinstall.sh; \
+wget <%= stage_done_url("preseed") %>
+

tasks/ubuntu/bionic.task/store_ip.erb

@@ -0,0 +1,10 @@
+<%# -*- shell-script -*- %>
+# Get current IP
+node_ip=$(ip addr show | grep -A 2 BROADCAST | grep inet | awk '{ print $2 }' | awk -F'/' '{print $1}')
+echo IP is $node_ip
+
+# Send IP up
+curl -s <%= store_url("ip" => "$node_ip") %>
+
+# Send final state
+curl -s <%= stage_done_url("store_ip") %>