Code review comment for lp://staging/~wesley-wiedenmeier/curtin/1562249

I updated the cciss fix based on the cloud-init-output log here:
http://paste.ubuntu.com/18737231/

I believe I can write a vmtest for this by slightly modifying the environment curtin is running under, I am going to attempt that before merging, but I want to see if this passes vmtests first so I'm marking it ready for review again