Added date to release notes for recent salt versions

These dates were pulled out of the Git commit for the tag (with a Vim
macro). I didn't go back before we started tagging releases with
annotated tags since that would take some mailing list archaeology. Also
there might be a couple instances where the tag came plus or minus a day
or two from the announcement.

Closes #9426
Merge pull request #9428 from gravyboat/develop

Update to pkg state example, and master troubleshooting topic.
Added a line explaining that the user would need to re-establish their sessions as the user they modified the limits for in the master troubleshooting guide.