[keycloak-dev] Fixes for MySQL 5.1

[Stian Thorgersen]

I've added some fixes for MySQL 5.1 to https://github.com/stianst/keycloak/commit/723a50197ce4489c30d1ca3604c0eb915b01c1d5

Bill - can I commit this now? Or do you want me to wait until after you've finished (I don't mind merging it once it is)?

Basically it doesn't support keys longer than 1000 bytes, which turns out to be varchar 200, not 255 as default. So I've set all id's that are uuid's to 36, and the others to 200 (user username only, and only used as a foreign key in login failures).