Put in ulsim a channel matrix H_awgn_mimo different from identity (it is a matrix equal to matrix used in dlsim)

integration_2022_wk17

See merge request oai/openairinterface5g!1539

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Fix in atxlev computation in ulsim (the loop should be over nb_antennas_tx and not nb_antennas_rx) and remove wrong sigma_dB computation

Conflicts:
	targets/ARCH/rfsimulator/simulator.c

Conflicts:
	openair2/LAYER2/nr_rlc/nr_rlc_entity_am.c

fix 2 bugs: one new introduced by merge develop, one introduced by extra change asked in code review

 - Better mechanism for qlog cleaning
 - Faster attachment check
 - html.py is confusing for some python3 installation -- renaming it
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>