trxcon/trx_if: send NOPE indications if there is no burst

In a typical setup operating on the real radio interface, it's
the duty of the transceiver (e.g. osmo-trx) to send NOPE.ind to
the L1 implementation (e.g. osmo-bts-trx).  However, in a
virtual environment for ttcn3-bts-test we use a fake transceiver,
which due to its simplicity cannot send NOPE indications itself.

The lack of queues and buffering does not allow us to implement
NOPE indications in fake_trx.py, so the easiest approach is to
generate them from trxcon.  Send TRXD PDUs without the burst bits,
and fake_trx.py will tranform them info NOPE.ind for us.

Change-Id: I1c7f1315b8ef44f651efd6a22fb5b854f65c0946
Related: SYS#5313, OS#1569

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