Additional test state fixes

In running some tests downstream, in this case where someone had
aggressively asserted default interface values, some additional
tests failed, and in fun ways.

This changes a couple tests so they explicitly set and account
for differeing defaults from upstream CI. Also adds an inline note
on the Boot from Volume test which can fail if the volume creation
fails.

Change-Id: Ieaa7ac9d9058ba40955248699e8fd762d4b3c15d
3 files changed