lr-wpan: Fixes PHY not going to TRX_OFF after CSMA-CA failure (rxOnWhenIdle(false))

Alberto Gallegosrequested to merge
shattered.feelings/ns-3-dev:phyIdleBug into master

(Solves #536 (closed)).

When RxOnWhenIdle(false) is set in lr-wpan MAC, the PHY should go to TRX_OFF whenever the MAC is idle. However, in the current implementation, if the CSMA fails after a transmission attempt the MAC goes idle but the PHY does not go back to TRX_OFF.

This MR fixes that problem. A test is included.

Edited by Alberto Gallegos

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