Normalization of the file names for CU and DU

.gitignore

cmake_targets/CMakeLists.txt

cmake_targets/lte_noS1_build_oai/CMakeLists.template

cmake_targets/oaisim_build_oai/CMakeLists.template

cmake_targets/oaisim_mme_build_oai/CMakeLists.template

cmake_targets/oaisim_noS1_build_oai/CMakeLists.template

openair2/COMMON/f1ap_messages_types.h

openair2/ENB_APP/enb_app.c

openair2/ENB_APP/enb_config.c

openair2/F1AP/f1ap_cu.c

openair2/F1AP/f1ap_cu_defs.h

openair2/F1AP/f1ap_cu_task.h

openair2/F1AP/f1ap_decoder.c

openair2/F1AP/f1ap_du.c

openair2/F1AP/f1ap_du.h

openair2/F1AP/f1ap_du_defs.h

openair2/F1AP/f1ap_du_task.h

openair2/F1AP/f1ap_handlers.c

targets/COMMON/create_tasks.c