WL#4912: ConsoleLogger for ndbd

Remove the use of of EventLogger from ndbd and instead let it use a leaner class
ConsoleLogger for printouts. 

ConsoleLogger should support the Logger interface but not need to lock a global
mutex for each printout, thus eliminating the problem where ndbd may deadlock
itself after a "crash" inside logger. this is especially important in the "crash
code".

To avoid locking a global mutex, we will only suppress repeated messages on a
per thread basis. Each thread may store it's latest message in thread local storage.