rstp: Set mac_operational for rstp ports. (temporary fix)
Revert "rstp: Fix global transitions."

This reverts commit 1bcaa6f4616f80b217fb5b1e55c98fed9e7bab34.
rstp: Remove else if from state machines.

    Where two or more exit conditions with the same level of precedence become
    TRUE simultaneously, the choice as to which exit condition causes the state
    transition to take place is arbitrary.
rstp: Fix global transitions.

      Check global transitions when exiting from a state.
rstp: Fix global transition in port_information_sm.