[Bug 1444992] Re: fastpath install duplicates iSCSI initiator names, blocking iSCSI HW

[Nish Aravamudan]

Note that even with this fix, end users if they use their own image based off 
an instance that used a cloud image to start will probably trigger: https://bugs.launchpad.net/ubuntu/+source/open-iscsi/+bug/1677726.

I am thinking we should revisit the overall design a bit and ensure that
behavior makes sense and is necessary for all use cases. I'll try and
set something up but will follow-up in the other bug, FYI.

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https://bugs.launchpad.net/bugs/1444992

Title:
  fastpath install duplicates iSCSI initiator names, blocking iSCSI HW

Status in cloud-images:
  New
Status in curtin:
  Triaged
Status in MAAS:
  Triaged
Status in maas-images:
  Triaged
Status in livecd-rootfs package in Ubuntu:
  Fix Released

Bug description:
  When using fastpath install, each host is given an identical iSCSI
  initiator name. This does not happen with Debian install mode. The
  result is HW SANs that use iSCSI get confused. This is an actual
  customer/partner issue at present.

  It would appear to be fallout of the image based approach to installation.
  The /etc/iscsi/initiatorname.iscsi file contains something like:
   ## DO NOT EDIT OR REMOVE THIS FILE!
   ## If you remove this file, the iSCSI daemon will not start.
   ## If you change the InitiatorName, existing access control lists
   ## may reject this initiator.  The InitiatorName must be unique
   ## for each iSCSI initiator.  Do NOT duplicate iSCSI InitiatorNames.
   InitiatorName=iqn.1993-08.org.debian:01:dcafddf1c8b

  That is what gets used as the initiator, and is seemingly generated at
  package-install time. It needs to be re-created
  uniquely per installed host.

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