Properly implement the exponential backoff timer on session initialization

According with the section 2.5.3 of RFC 5036, an LSR must throttle its
session setup retry attempts with an exponential backoff in situations
where Initialization messages are being NAK'd (because of disagreements
on session parameters). It doesn't mention using this procedure for TCP
connection failures. With that said, start the inactive delay timer only
after receiving an appropriate notification message.

When playing the active role of the initialization process, throttle the
session setup retry attempts by not connecting to the remote peer. When
playing the passive role, throttle the session setup retry attempts by
delaying the processing of the received Initialization message.

Diff by Renato Westphal, adjusted by myself

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