Add make-update script and fix release script.

make-update script is for generating an update for an existing release,
e.g. for a bug fix update.

release script is for generating a new release.

Per-package tagging may fail on the release script if the version
has not changed; this is harmless.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2 files changed