Support MIME multipart bootstrapping on KVM with config drive 7.0.1

On KVMs, FortiOS supports bootstrapping using a MIME file with config drive.

Sample MIME file

Content-Type: multipart/mixed; boundary="===============0740947994048919689=="
MIME-Version: 1.0

--===============0740947994048919689==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="config"

config sys glo
set hostname mimecheck
set admintimeout 480
end
config sys admin
edit admin
set password 12345678
end

--===============0740947994048919689==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="license"

-----BEGIN FGT VM LICENSE-----
************/***************************************************
...
-----END FGT VM LICENSE-----

--===============0740947994048919689==--

To bootstrap a KVM using a MIME file with config drive:

1. Create a config drive ISO with a MIME file. See for Cloud-init using config drive for more information.

   cd /home/kvm/bootstrap
   cp mimefile.txt /home/kvm/bootstrap/kvm-cloudinit/openstack/latest/user_data
   #optional, since license file is also in the mime file
   cp /home/kvm/bootstrap/licenses/UL_license.txt
   home/kvm/bootstrap/kvm-cloudinit/openstack/content/0000
   mkisofs -R -r -o fgt-bootstrap.iso kvm-cloudinit

2. Attach the ISO config drive at boot time. See Cloud-init for more information.

   virt-install --connect qemu:///system \
           --name ${DOMAIN} \
           --virt-type kvm \
           --arch=${ARCH} \
           --hvm \
           --os-type=linux \
           --os-variant=generic \
           --graphics vnc,listen=0.0.0.0 --noautoconsole \
           --vcpus=${CPU} \
           --ram ${RAM} \
           --cpu host-passthrough \
           --sysinfo host \
           --disk ${DOMAIN}.qcow2,device=disk,bus=${DISKMODE},format=qcow2,cache=none \
           --disk ${DOMAIN}-log.qcow2,device=disk,bus=${DISKMODE},format=qcow2,cache=none \
           --disk ${DOMAIN}-wanopt.qcow2,device=disk,bus=${DISKMODE},format=qcow2,cache=none \
           --disk ${DOMAIN}-bootstrap.iso,device=cdrom,bus=${DISKMODE},format=raw,cache=none \
           --network bridge=br0,model=${NICMODE},mac=**:**:**:**:**:11 \
           --network bridge=br1,model=${NICMODE},mac=**:**:**:**:**:22 \
           --network bridge=br2,model=${NICMODE},mac=**:**:**:**:**:33 \
           --import

3. Boot up the VM and verify the FortiGate bootstrap:

   # diagnose debug cloudinit show
    >> Checking metadata source config drive
    >> Found config drive /dev/vdd
    >> Successfully mount config drive
    >> MIME parsed config script
    >> MIME parsed VM license
    >> Found metadata source: config drive
    >> Trying to install vmlicense ...
    >> Checking metadata source config drive
    >> Found config drive /dev/vdd
    >> Successfully mount config drive
    >> MIME parsed config script
    >> MIME parsed VM license
    >> Found metadata source: config drive
    >> Config drive parse metadata json failed
    >> Run config script
    >> Finish running script
    >> FGVM01TM21000000 $  config sys glo
    >> FGVM01TM21000000 (global) $  set hostname mimecheck
    >> FGVM01TM21000000 (global) $  set admintimeout 480
    >> FGVM01TM21000000 (global) $  end
    >> mimecheck $  config sys admin
    >> mimecheck (admin) $  edit admin
    >> mimecheck (admin) $  set password ********
    >> mimecheck (admin) $  end
    >> mimecheck $  config sys glo
    >> mimecheck (global) $  set hostname mimecheck
    >> mimecheck (global) $  set admintimeout 480
    >> mimecheck (global) $  end
    >> mimecheck $  config sys admin
    >> mimecheck (admin) $  edit admin
    >> mimecheck (admin) $  set password ********
    >> mimecheck (admin) $  end

4. Verify that the VM license is valid:

   # get system status
   Version: FortiGate-VM64-KVM v7.0.1,build0125,210517 (interim)
   Virus-DB: 1.00000(2018-04-09 18:07)
   Extended DB: 1.00000(2018-04-09 18:07)
   Extreme DB: 1.00000(2018-04-09 18:07)
   AV AI/ML Model: 0.00000(2001-01-01 00:00)
   IPS-DB: 6.00741(2015-12-01 02:30)
   IPS-ETDB: 6.00741(2015-12-01 02:30)
   APP-DB: 6.00741(2015-12-01 02:30)
   INDUSTRIAL-DB: 6.00741(2015-12-01 02:30)
   IPS Malicious URL Database: 1.00001(2015-01-01 01:01)
   Serial-Number: FGVM01TM21000000
   License Status: Valid
   License Expiration Date: 2022-05-06
   VM Resources: 1 CPU/1 allowed, 3962 MB RAM
   Log hard disk: Available
   Hostname: mimecheck
   Private Encryption: Disable
   Operation Mode: NAT
   Current virtual domain: root
   Max number of virtual domains: 10
   Virtual domains status: 1 in NAT mode, 0 in TP mode
   Virtual domain configuration: disable
   FIPS-CC mode: disable
   Current HA mode: standalone
   Branch point: 0125
   Release Version Information: interim
   FortiOS x86-64: Yes
   System time: Wed May 19 21:48:12 2021
   Last reboot reason: warm reboot