prep 9.17.0

prep 9.17.0

The files configure.ac and version are already up to date.

Updated CHANGES with 9.17.0 release line.

Fixed CHANGES by adding GitLab reference to entry 5357 and fix
grammar mistakes.

Add missing /util/check-make-install.in to .gitattributes.

The lib/*/api are already updated to match the new ranges.

I listed two new features under BIND 9.17 features that to me
seemed noteworthy.

The release notes look good to me.