Flexran-triggered RRC Reconf: free memory of mac_MainConfig after setting new, do not free new memory

To be tested: Add code for measurement report based on the neighbouring cells after x2 setup, ocs/ocn for multiple cells

Create RRC struct and getters for Periodic, A1-A5 event and offsets related to RRC Measurement Report

fixes: segmentation faults issues in RRC CM for RRC Measurement report, clean-up and re-implementation of functions in RAN API

Develop: Integration 2019 Week 25

See merge request oai/openairinterface5g!617

The following Merge Requests are included:

* MR 576 : Multi-RU support and OTA Synch/Calibration for TDD
* MR 589 : UE side FeMBMS-EnTV
* MR 610 : Enhance CI with external EPC usage
* MR 614 : fixed rar_Hopping configuration for eMT
* MR 619 : bugfix: fix RRC UE removal
* MR 620 : Coverity Scan defect fixes

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Merge remote-tracking branch 'origin/434-coverity-scan-fix-week25' into develop_integration_2019_w25

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Remove Coverity Scan CID 261519 (Using uninitialized value tmp. Field tmp.elems is uninitialized when calling _mm256_insert_epi16.)

Remove Coverity Scan CID 261470 (Using uninitialized value tmp. Field tmp.elems is uninitialized when calling _mm256_insert_epi8.)

Remove Coverity Scan CID 60471 (Function memory_read does not terminate string *user->nas_user_nvdata.)

Remove Coverity Scan CID 60241 (Passing &eplmn to function emm_proc_attach_accept which uses it as an array. This might corrupt or misinterpret adjacent memory locations.)

If several UEs are removed, the variable ue_to_be_removed may be overwritten.
Let's use an array instead.

Fix Coverity Scan CID 339954 (Overrunning callee's array of size 16 by passing argument ue_id (which evaluates to 65535) in call to flexran_set_ue_ul_slice_idx.)

Fix Coverity Scan CID 339964 (Passing &rrc_eNB_mui to function rrc_eNB_process_S1AP_DOWNLINK_NAS which uses it as an array. This might corrupt or misinterpret adjacent memory locations.)

Fix Coverity Scan CID 339974 (Overrunning array eutra_bandtable of 48 24-byte elements at element index 48 (byte offset 1152) using index i (which evaluates to 48).)