Grenade does not support the fast forward upgrade so old release
wise script are not in use in current grenade support.
from-* script in current grenade will only be run via from-$BASE_DEVSTACK_BRANCH
- 1a1f58a69e/inc/upgrade (L92)
and BASE_DEVSTACK_BRANCH will be wallaby for current master grenade or
immediate previous release which means we do not need to keep the older
releases upgrade extra scripts.
Ditto for within-* script.
Change-Id: I66b021f03faa38f976243b7f194454360def215f
f94c0ae3e2