Fix low level warrior tank to build rage and hold aggro in dungeons

Classes Warrior
1

It is a million times easier to tank with druid. Warrior is broken.

2

Thunderclap should be earlier in Warrior the tree. Guardian gets Thrash much sooner.

3

I have to ignore Ignore Pain when I pull packs

4

The big difference is, that bear druids get a resource free aoe without any cd, which no other tank gets. It does not make a big difference in late game, but its incredible in early game.