* Started logger replacement in epc main.
* Replaced loggers in nas and s1ap.
* Replace loggers in nas statics.
* Replaced loggers in s1ap ctx mngmt.
* Replace loggers in s1ap erab mngmt.
* Replaced loggers in s1ap mngmt proc.
* Replaced loggers in s1ap nas transport.
* Replaced loggers in s1ap paging.
* Replaced loggers in mme.
* Replaced loggers in mme gtpc.
* Started removing logger injection in init functions and cleaned up argument passing to nas statics.
* Remove logger injection from mme and s1ap.
* Replaced loggers in the hss class.
* Replaced loggers in gtpc.
* Replaced loggers in GTPU and SPGW.
* Replaced loggers in MBMS.
- Handle received E-RAB S1AP at s1ap.cc.
- Added methods to rrc.cc, rrc_ue.cc and rrc_bearer_cfg.cc to handle erab modify request.
- Made RLC add_bearer() function capable of re-creating the RLC entity.
- Send RRC reconfiguration to the UE and reply to the EPC with S1AP
modify bearer response.
This commit also adds support to srsEPC to send S1AP modify bearer request for
testing purposes.