release: basic-cloudinit improve default image

- Add the firstboot-freebsd-update package, as long as we do not have
  pkgbase, this is needed
- Support SLAAC by default to complement DHCPv4 (use SYNCDHP instead)

Signed-off-by: Jose Luis Duran <jlduran@gmail.com>
(cherry picked from commit 120740221fd4a4577e63e6c279f9873cabe449d0)

release/tools/basic-cloudinit.conf

@@ -1,6 +1,4 @@
 #!/bin/sh
-#
-#
 
 # Should be enough for base image, image can be resized in needed
 export VMSIZE=5g
@@ -9,13 +7,17 @@ export VMSIZE=5g
 export CONFIG_DRIVE=YES
 export CONFIG_DRIVE_SIZE=1M
 
+# Packages to install into the image we're creating.
+# * firstboot-freebsd-update, to install security updates at first boot.
+export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} firstboot-freebsd-update"
+
 # Set to a list of third-party software to enable in rc.conf(5).
-export VM_RC_LIST="sshd growfs nuageinit"
+export VM_RC_LIST="${VM_RC_LIST} firstboot_freebsd_update growfs sshd nuageinit"
 
 vm_extra_pre_umount() {
 	cat << EOF >> ${DESTDIR}/etc/rc.conf
 dumpdev="AUTO"
-ifconfig_DEFAULT="DHCP"
+ifconfig_DEFAULT="SYNCDHCP accept_rtadv"
 sshd_enable="YES"
 EOF
 
@@ -25,7 +27,8 @@ beastie_disable="YES"
 loader_logo="none"
 console="comconsole,vidconsole"
 EOF
-    cat <<EOF >> ${DESTDIR}/etc/ssh/sshd_config
+
+	cat << EOF >> ${DESTDIR}/etc/ssh/sshd_config
 PasswordAuthentication yes
 UsePAM no
 EOF