Ping on AES rotate

Immediately after an AES key rotate, ping all the minions. Should help
resolve #15415.
Only ping connected minions
Fire an event on AES key rotate.

Also setup a config file option for ping-on-rotate.
Merge branch 'rotate_event' into issue_15415
Implement flag for ping_on_rotate
Add docs about auth retry options
Add note about large install to config file
Set default to false
Merge pull request #15722 from cachedout/issue_15415

Ping on AES rotate