Q: Do villain classes get to start with 2 traits like PCs?

If the base creature of the villain class is a human, yes. Otherwise, no.

Q: Do monsters found in the IH bestiary get to start with 2 traits like PCs?

Not unless explicitly stated so in their description (I don't remember any that do).

Q: Do monsters found outside the IH bestiary get to start with 2 traits?

No.