Make plugins/engines identify themselves in the error log upon startup and shutdown (on the Note level)

Currently there is no consistency in whether engines/plugins write a note about their start in the error log or not.
InnoDB does it nicely (although it writes a lot of other stuff as well):

...

2016-03-18 15:18:18 140535826946816 [Note] InnoDB: 5.6.29 started; log sequence number 1694001

...

2016-03-18 15:19:29 140535826946816 [Note] InnoDB: Shutdown completed; log sequence number 1694011

But others aren't so open about it. It becomes a major inconvenience when we investigate problems reported by users, because sometimes it's impossible to guess which plugins or engines were running at the time of failure; especially so if they were installed dynamically, so there is no sign of them in the cnf files (or if they were removed/commented out from cnf files since then).