The problem is the following (as reported by an user):

  "one UE is attached to OAI system. UE is near the antenna. Try to detach
  the UE and attach again. Repeat this procedure for 5-6 times. OAI system
  does not work and any the UE can not attach to this system. I use TEMS
  software and I can see MIB signaling on this UE but UE can not decode SIB1
  and SIB2."

What happens is that the DCI for SIB1 and SIB2 is not cleared before
use. That is the bits in the 'padding' field keep the values that were
set before. If the structure has been used to transmit other DCIs
(eg. for UEs) in the past, it may be reused with some of those bits set
to 1. When receiving this DCI, the UE won't accept it because it
gets some bits at 1 where it expects them to be 0.

The short-term/quick solution is to clear the 'padding' field.
A better solution would be to rewrite this part of the code,
which is way too complicated for what it does. But this takes
too much time.

In dci.h the field 'dummy' of some structures was renamed to 'padding'.
The fields 'padding32' and 'padding64' were also renamed to 'padding'
for consistency.

Some structures (DCI2B_1_5MHz_TDD, DCI2B_10MHz_FDD, DCI2D_1_5MHz_FDD,
DCI2D_5MHz_FDD, DCI2D_10MHz_FDD) had a 'padding' field at the end, which
was renamed to 'padding0'. I don't know if this field should be here at all.
To me this field looks very suspicious. When we test DCIs 2B and 2D we
should be careful.

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

Conflicts:
	targets/DOCS/oai_L1_L2_procedures.pdf

Summary of changes:

- minor changes in RA code (functionality not changed, only notation)
- automatic indentation of some files (with indent -kr)
- bugfixes for TDD in RRU (IF4p5) and timing statistics of fronthaul and
  compression

changing of notation for Random-Access procedure to match documentation. Function remains the same. Indentation (-kr) run on all files in LAYER2/MAC

Summary of changes:
- fix a bug with Timing Advance.
  This should improve the stability of the connection
  (for now, only the scenario with one connected UE works).
- use RRC Release 14.3
- add some T tracers, minor fixes for T

Conflicts:
	common/utils/T/.gitignore
	common/utils/T/tracer/Makefile

Sometimes when the user does ctrl+c to quit, it may not quit
if nothing comes on the socket. Closing the socket in the
signal handler fixes this.

Do not link the X stuff for tracers not needing it.

Later on, use this file with gtkwave.
To be used to check realtime behaviour of the system.