Correct workaround in OSSN-0013

The workaround previously described in OSSN-0013 was not correct
due to a misunderstanding in the behavior of the original bug. This
update adds a workaround that has been tested in Havana, and it also
provides a more clear description about Glance's broken behavior
with regards to processing property protections rules.

Related-Bug: #1271426
Change-Id: Ice8f6d31345c308f09ee14b55053d205d9f57e69