
Some OpenStack-CI providers do not meet the current minimum of 60GB. Bluebox in particular is providing instances with a root disk size of around 58GB. With the updates to reduce the repo build size and the implementation of overlayfs-based container builds, we have reduced our disk space requirements to just over 40GB. This patch sets a new minimum of 50GB. Change-Id: Id949549906260dbe57a6b413dcc99497f9492310