-Schedule IP traffic when it is available and random data when there is no IP traffic

 Conflicts:
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c

c_SRS was 61, which does not fit for 106 PRBs as it seems. Value 0 works.
Maybe not the right thing to do though (see 38.211 6.4.1.4.3,
table 6.4.1.4.3-1).

Also it seems necessary to pass desired LTE/NR bands when requesting
LTE UE capabilities. Today this is hardcoded, to be done better at
some point. We should get the bands from the eNB configuration and
the eNB/gNB X2 exchanges.

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

Oai integration week29

See merge request oai/openairinterface5g!858

Conflicts:
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_phytest.c

Develop integration 2020 weeks 27/28

The following Merge Requests have been included:

* MR 842 : NR RRC HARQ hacks
* MR 843 : hack for RLC AM ACK reporting
* MR 844 : gcc warnings
* MR 846 : nr-rlc: small bugfix
* MR 848 : NR VCD
* MR 852 : bugfix: uplink ACK/NACK reporting through T was gone
* Documentation update
* Some CI improvements

When running the softmodem, we get the error:

    fill_ulsch UE_id 0 nb_rb = 0

The code has changed some time ago and this log was left but is not
meaningful anymore.

Let's get it back!

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>