Generate CHANGES.md and RELEASENOTES.md for 2.0.5

$ cd /Users/stack/checkouts/yetus.git
$ ./release-doc-maker/releasedocmaker.py -p HBASE --fileversions -v 2.0.5 -l --sortorder=newer --skip-credits

... produces CHANGELOG.2.0.5.md and RELEASENOTES.2.0.5.md.

Then in hbase.git checkout of branch-2.0 tip, edit the CHANGES.md.

Set the 2.0.4 released date.

Read in the generated yetus file. Drop the license and the Changelog header (already license and header in the file we are reading into). Ditto for RNs.