Cherry-pick r1462402 from branches/verify-at-commit.  This removes a 'verify'
call in maintainer builds and simplifies code.

(As a side-effect, this will cause the eventual coalescion of the branch
into trunk to not be a simple "reintegrate-style" merge.)

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1462403 13f79535-47bb-0310-9956-ffa450edef68
On the verify-at-commit branch, sync from trunk.  This is a no-op.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/verify-at-commit@1462404 13f79535-47bb-0310-9956-ffa450edef68
On the verify-at-commit branch, update BRANCH-README.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/verify-at-commit@1462405 13f79535-47bb-0310-9956-ffa450edef68