PCT-985 InnoDB Stats are not re-enabled after MySQL restart

At the risk of seeming crazy and hung up on the names of things, I think we should keep var names as consistent as possible. Here we have `mrm`, `rm`, and above (in `mm/manager.go`) `restartMon`, and below (in `mm/mysql/monitor.go`) `mrmsMon`. We also have `mysqlRestartMonitor` in `agent.go`. So that's 5 different names for the same singleton service. I like `mrms` (because in English it's like "Mr. Ms." so easy for me to recall) or just `mrm` is fine too.