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bugfix: try to handle USRP devices correctly to avoid crashes

Merged Cédric Roux requested to merge bugfix-release-usrp into develop

Some problems when we release the device:

- Calling the destructors is wrong, we should set the pointers to NULL.
  These are shared pointers, this is C++.
- We have to stop rx by doing a STREAM_MODE_STOP_CONTINUOUS.
- The end-of-burst for tx has been simplified.

This problem when we acquire the device:

- Calling get_rx_stream() many times seems to be problematic.

We now should have a better behavior with UHD 4.2 and N310. (Hopefully with others too.) No crash seen so far.

Edited by Cédric Roux