fix compatibility with nexus dash (#1011)

* add some more utility to the masterserver -a command
fix compatability with nexus dash

* cleanup code some more
user logger where it makes sense
only take in password if it is needed
log a better error if account cannot be created

* update message

* return before success statement if catching error

migrations/dlu/8_foreign_play_key.sql

@@ -0,0 +1 @@
+ALTER TABLE accounts MODIFY play_key_id INT DEFAULT NULL;