Refactor E1 Bearer Context Management structs

Bearer context setup request and modification request messages
differ in various IEs according to 9.2.2 of 3GPP TS 38.463, e.g.
the Bearer context setup request does not contain a list of
DRBs to modify and does not contain an UP TL configuration.

Thus, the goal of this commit is to split the setup request message
and the modification request into two different structs:
* adopt e1ap_bearer_mod_req_t where necessary (e.g. fill_e1_bearer_modif)

Also, reorganized existing struct members according to specs:
* remove irrelevant struct members from the setup request
* group members from the same IEs into structs
* set optional struct members IEs as pointers
* add and adopt enc/dec/cp/eq lib functions for single IEs
* add UP_TL_information_t struct with TEID and TL address info and adopt in stack
* use int instead of long for count types
* update the relevant copy/equality check utility functions

Extra:
* add a function to handle Security Information in RRC in the process
* add create_up_tl_info and adopt in unit tests

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -125,7 +125,7 @@ void nr_derive_key_ng_ran_star(uint16_t pci, uint64_t nr_arfcn_dl, const uint8_t
 int dummy_nr_ue_ul_indication(nr_uplink_indication_t *ul_info) { return(0);  }
 
 void e1_bearer_context_setup(const e1ap_bearer_setup_req_t *req) { abort(); }
-void e1_bearer_context_modif(const e1ap_bearer_setup_req_t *req) { abort(); }
+void e1_bearer_context_modif(const e1ap_bearer_mod_req_t *req) { abort(); }
 void e1_bearer_release_cmd(const e1ap_bearer_release_cmd_t *cmd) { abort(); }
 
 int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index) {

openair1/SIMULATION/NR_PHY/psbchsim.c

@@ -51,7 +51,7 @@ void e1_bearer_context_setup(const e1ap_bearer_setup_req_t *req)
 {
   abort();
 }
-void e1_bearer_context_modif(const e1ap_bearer_setup_req_t *req)
+void e1_bearer_context_modif(const e1ap_bearer_mod_req_t *req)
 {
   abort();
 }

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -126,7 +126,7 @@ void nr_derive_key_ng_ran_star(uint16_t pci, uint64_t nr_arfcn_dl, const uint8_t
 extern void fix_scd(NR_ServingCellConfig_t *scd);// forward declaration
 
 void e1_bearer_context_setup(const e1ap_bearer_setup_req_t *req) { abort(); }
-void e1_bearer_context_modif(const e1ap_bearer_setup_req_t *req) { abort(); }
+void e1_bearer_context_modif(const e1ap_bearer_mod_req_t *req) { abort(); }
 void e1_bearer_release_cmd(const e1ap_bearer_release_cmd_t *cmd) { abort(); }
 
 int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index) {