Apply ros-perception#509 and ros-perception#526 to Noetic Branch (ros…

…-perception#528)

* Fix import path on camera_calibrator.py (ros-perception#509)

* clone cv_ptr->image before set queued_image (ros-perception#526)

Co-authored-by: Gonçalo Camelo Neves Pereira <goncalo_pereira@outlook.pt>
Co-authored-by: Kei Okada <k-okada@jsk.t.u-tokyo.ac.jp>

camera_calibration/src/camera_calibration/camera_calibrator.py

@@ -47,7 +47,7 @@
     from queue import Queue
 except ImportError:
     from Queue import Queue
-from calibrator import CAMERA_MODEL
+from camera_calibration.calibrator import CAMERA_MODEL
 
 class BufferQueue(Queue):
     """Slight modification of the standard Queue that discards the oldest item