Include 'role[os-image-upload]' to upload images

The os-image role is a roll-up role, so if any attributes for uploading images
are included, they'll get uploaded. Also included replacing double-quotes with
single quotes, per rubocop's complaints.

Change-Id: I38b53033dfb56ae8f8e1256cbb6c04208abb0b26
Merge "Include 'role[os-image-upload]' to upload images"
Update Grizzly mention in README to Havana

Change-Id: Ife369acc5a5625cdf76f82cb3b9e0e729b3889ec