Develop integration 2020 week 24

The following Merge Requests are included:

* MR 822 : GPU implementation in `ldpctest` unitary test (NCTU)
* A few CI python fixes and to enable back parallel build on RRU
* Documentation update on the supported feature list

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

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

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

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures

- Make required adaptations in RLC and default DRB configuration

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

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

update of the 5G feature set (gNB and UE)
ref : Florian K ppt

eNB RRC version
eNB X2AP section

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

update of the 5G feature set (gNB and UE)
ref : Florian K ppt

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

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

eNB RRC version
eNB X2AP section

- no_data_in_dmrs was being used at gNB side, and not handled at UE side
- nr_schedule_response wasn't being called in ulsim

- scheduling is needed only when whe it doesn´t fall in dci_ind or rx_ind cases
- cleaned up some old commented out code

Conflicts:
	cmake_targets/CMakeLists.txt
	openair2/GNB_APP/gnb_app.c
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c
	openair2/RRC/NR/rrc_gNB_nsa.c