Introduce no-thread mode in ITTI

Introduce a --no-itti-threads command line option to disable threading
in ITTI, and call message handlers in the current thread. This is being
introduced in order to increase repeatability when testing the nrUE with
the IQPlayer. Without this feature, runs with the IQPlayer will end up
differently, depending on the timing of ITTI threads, mostly when
sending messages to RRC and NAS.

executables/nr-uesoftmodem.c

@@ -197,7 +197,8 @@ int create_tasks_nrue(uint32_t ue_nb) {
 
   if (ue_nb > 0) {
     LOG_I(NR_RRC,"create TASK_RRC_NRUE \n");
-    if (itti_create_task (TASK_RRC_NRUE, rrc_nrue_task, NULL) < 0) {
+    const ittiTask_parms_t parmsRRC = {NULL, rrc_nrue};
+    if (itti_create_task(TASK_RRC_NRUE, rrc_nrue_task, &parmsRRC) < 0) {
       LOG_E(NR_RRC, "Create task for RRC UE failed\n");
       return -1;
     }
@@ -208,7 +209,8 @@ int create_tasks_nrue(uint32_t ue_nb) {
         return -1;
       }
     }
-    if (itti_create_task (TASK_NAS_NRUE, nas_nrue_task, NULL) < 0) {
+    const ittiTask_parms_t parmsNAS = {NULL, nas_nrue};
+    if (itti_create_task(TASK_NAS_NRUE, nas_nrue_task, &parmsNAS) < 0) {
       LOG_E(NR_RRC, "Create task for NAS UE failed\n");
       return -1;
     }