Merge branch 'issue271_hundreds_of_ues' of https://gitlab.eurecom.fr/oai/openairinterface5g into issue271_hundreds_of_ues

Merge branch 'issue271_hundreds_of_ues' of https://gitlab.eurecom.fr/oai/openairinterface5g into issue271_hundreds_of_ues

Summary of changes:
- bug fixes: random access, crash on physicalConfigDedicated)
- some work on the UE to have it functional again
- IQ record and playback (work from Nokia)
  see documentation at: https://gitlab.eurecom.fr/oai/openairinterface5g/merge_requests/244

Conflicts:
	targets/DOCS/oai_L1_L2_procedures.pdf

Merge branch 'fix_ue' of https://gitlab.eurecom.fr/florian.kaltenberger/openairinterface5g into fix_ue

making oaisim_nos1 compile

physicalConfigDedicated may be legitimately NULL at some places
with the current code.

A cleaner solution is needed (we should always have a dedicated
config, initialized with values from the 3GPP specs, not have
a NULL as we do now).

Even if the old UE is not found, we have to cancel the random access.

Merge branch 'fix_ue' of https://gitlab.eurecom.fr/florian.kaltenberger/openairinterface5g into fix_ue