Cyclic class 0/1: Have first I/O data production immediately

Currently, when a class 0/1 connection opens, we start the transmission trigger timer and generate the first I/O data not before this timer expires. Although the specification is not very explicit on this, it seems as if we are supposed to produce the first I/O data immediately in a best-effort manner.

When comparing with third party devices, it can be observed that these devices do not wait a full production cycle until the first I/O production happens.

Since it might address some very rare errors in the Conformance test, we should generate the first I/O frame ASAP after the connection has been established.