* Update the 1.7.1 notes

Add bunch of PR, remote the text that should show up in the 1.8.0
release.
Signed-off-by: Miek Gieben <miek@miek.nl>

* Update notes/coredns-1.7.1.md
Co-authored-by: Chris O'Haver <cohaver@infoblox.com>
Co-authored-by: Chris O'Haver <cohaver@infoblox.com>