prep release
better status output
Revert "Avoid propigating nonzero exit status of any command called by etckeeper out to the caller. This is to avoid making apt give up because git is misconfigured and cannot commit, or similar. Closes: #760011"

This reverts commit 1b70e83dddcafbcbea84fc55a6396e4876a9a0c4.

This approach breaks the AVOID_COMMIT_BEFORE_INSTALL feature.
Use debconf for prompting when post-install commit fails, as was already done for pre-install commit. This avoids propigating errors to apt when eg, git is misconfigured and cannot commit. Closes: #760011
let's not use debconf to display a possibly minor warning
prep release