Fix a bug in the rotation of previous FreeNAS builds, we need to determine the tag of the last build, not the current one when determing where to save its files to.
Fix a bug in the rotation of previous FreeNAS builds, we need to
determine the tag of the last build, not the current one when
determing where to save its files to.

iXsystems/ix-tests,iXsystems/ix-tests,iXsystems/ixbuild