Just to be clear, it isn't the error message that is a problem when
attempting to boot, its that the system will not boot with multipath
support because the multipath discovery in the initrd is performed
before the SCSI devices are available. Removing the current code
referring to the removed module won't actually fix the issue as the
discovery will still take place before the qla2xxx driver has had a
chance to discover the LUN's, thus the root fs will be mounted on
/dev/sda instead of /dev/mapper/mpath0, and cannot be changed later (as
the LUN is currently active).

This is why I had to add in a sleep statement so that the multipath scan
takes place after the devices have been discovered. Not a clean solution
at all, but I am unsure as to what replaced the scsi_wait_scan given the
async changes.

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https://bugs.launchpad.net/bugs/1538775

Title:
  multipath-tools-boot relies on scsi_wait_scan module, fails multipath
  setup

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