The code was changing the rnti in the red-black tree without
removing/reinserting the context. This is wrong because the
rnti is a key of the red-black tree and you cannot change the
key in a stored item at will.

There are also modifications of the function mac_eNB_rrc_ul_failure
which has to remove the UE in any case.

And rrc_mac_remove_ue has been changed for the case where
the UE is not found.

Merge branch 'feature-44-dedicated-drb' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-44-dedicated-drb

iqlog.c should change its name, it's too specific.
This new one is more generic and should take over the name.

Merge branch 'develop' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-44-dedicated-drb

Merge branch 'feature-44-dedicated-drb' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-44-dedicated-drb

adding two rules for run_enb_ue_virt_s1 script to resolve the issue of data path with simulated UE (contributed by A. Ksentini)

It creates more problems than it solves.

We replace this approach by a straightforward
synchronous one.

Now in the downlink, at frame f and subframe s
we use HARQ process (f * 10 + s) % 8.
This is similar to uplink scheduling.

Merge branch 'feature-44-dedicated-drb' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-44-dedicated-drb