Develop Integration Branch : 2020 week 05

The following Merge Requests have been included :

* MR[702] : Add PUSCH-based TA updates (5G-NR)
* MR[764] : fix segv in drs_modulation.c (4G-LTE-UE)
* CI Python Framework improvement (X2 OpenAirCn Handover)
* Some Compilation warnings fixed

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

- now the UE is passing again data to the upper layers in noS1 mode
- minor cleanups

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

Develop integration 2020 week 04

See merge request oai/openairinterface5g!763

The following MRs have been included:

* MR [726] : Flexran improvements
* MR [756] : remove uhd_set_thread_priority function
* MR [757] : HOTFIX: After develop/develop-nr merge UE was crashing with MBMS U-Plane traffic running
* MR [758] : Improve build after nr lte merge
* MR [759] : Doc update after 5g lte merge and latest build procedure modifications
* MR [761] : fixes for mutex lock for wake up signal
* MR [761] : CI: count ULSCH received ok messages

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>

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>

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

    split the RRC inactivity scenarios
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

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

	-BUGFIX: CD/DU F1 split

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

update doc/BUILD.md and doc/RUNMODEM.md to reflect develop/develop-nr merge and latest merge requests affecting the build procedure

build improvements: allow build mode selection (-g -G options) allow all exec build in one pass, remove remaining USE_MME macros in nr code

 - configure_fapi_dl_pdu is handling the nfapi_nr_dl_config_request_pdu
 - while configure_fapi_dl_Tx is now handling the nfapi_tx_request_pdu

this was necessary because the computation of the TBS size is needed in the phytest scheduler
before even knowing if there is any data to transmit. The tx_request_pdu must be handled instead
only when there is data to transmit.