* deleted_libraries: Upgrade to Python 3
Python 2.7 will not be maintained past 2020. Therefore upgrade
text_collector_examples/deleted_libraries.py to Python 3.
* Add mellanox_hca_temp text collector example
mellanox_hca_temp is a script that reads Mellanox HCA temperature using
the Mellanox mget_temp_ext tool.
Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>
