Episys/initial channel model

See merge request aburger/openairinterface5g!21

Updating for operation with Proxy

See merge request aburger/openairinterface5g!18

Adding ue id parameter to pdcp_init
Updating tun interface functions for proxy

Episys/mel/nfapi mode logic

See merge request aburger/openairinterface5g!19

Every if statement that includes a check for
the NFAPI_MODE that did not check for the new
PNF_STANDALONE_MODE now has been updated. Also
changed the tx_req and dl_config_req logs
when they are received at the OAI UE to be
info logs instead of error logs.

Based on issues discovered by Zaid

Select fair RR packet scheduler

See merge request aburger/openairinterface5g!16

Also fixed some build problems

See cmake_targets/gdb.txt for notes

Episys/andrew/fixing multiue config

See merge request aburger/openairinterface5g!15

Fixed multiple UE EPC integration by resetting user->ueid=0;. Lots of logs in this commit, will remove later

Log the processor info like scheduler policy

See merge request aburger/openairinterface5g!14

And CPU affinity.
Also, use mlockall to keep our memory from being swapped out.

Dl_config_req and tx_req filtering allowed for either order

See merge request aburger/openairinterface5g!13

Additionally, combined many of the individual
dl_config_req and tx_req handle functions.
Also removed some unused functions we added.
Futhermore, removed our additions to the
dl_config_req and tx_req memcpy functions.

Episys/andrew/dl config+tx req combination

See merge request aburger/openairinterface5g!12

Additionally, combined many of the individual
dl_config_req and tx_req handle functions.
Also removed some unused functions we added.
Futhermore, removed our additions to the
dl_config_req and tx_req memcpy functions.

Episys/andrew/dci0 filtering

See merge request aburger/openairinterface5g!10

Episys/andrew/dlsch pdu index bug fix

See merge request aburger/openairinterface5g!9

This reverts commit b1ff8e1a.

This commit includes:

See merge request aburger/openairinterface5g!7

1.) Shutdown fix which allows us to see who requested to abort the simulation
2.) Properly initializing the NAS layer which previously was not happening for our simulation mode 5
3.) Changes in configurations to support the EPC(Have Melissa Verify these)

Look only at the last `max_depth` items on the queue, at most.

Episys/andrew+mc/tx pdu list change+dl config req dropping

See merge request aburger/openairinterface5g!5

To match emane.

Checked with:
```
ps ax -o pid,class,priority,comm |grep RR
```

Synchronized with emane.git's implementation of this code which
includes a unit test.

This commit also fixes two bugs in unqueue_matching and one inb
unqueue:

- unqueue_matching was returning the wrong pointer when
  there was no match

- both unqueue_matching and unqueue were not clearing the vacated
  queue entry after removing the item

```
$ ps -eL -o pid,lwp,class,priority,comm | grep -E softmodem|oai:'
 6500  6500 RR  -80 lte-softmodem
 6500  6520 RR  -80 oai:enb-L1-rx
 6500  6522 RR  -80 oai:enb-L1-tx
 6508  6508 RR  -80 lte-uesoftmodem
 6508  6537 RR  -80 oai:ue-phy
 6508  6538 RR  -80 oai:ue-stand
 6509  6509 RR  -80 lte-uesoftmodem
$
```

Episys/andrew/dropping dl config req and tx req

See merge request aburger/openairinterface5g!3

To match emane.

Checked with:
```
ps ax -o pid,class,priority,comm |grep RR
```

Episys/andrew/ul config req filtering

See merge request aburger/openairinterface5g!2

To match emane.

Checked with:
```
ps ax -o pid,class,priority,comm |grep RR
```