register handler for SIGTERM and SIGKILL in UE, eNB and EPC

srsenb/src/main.cc

@@ -365,6 +365,8 @@ void *input_loop(void *m)
 int main(int argc, char *argv[])
 {
   signal(SIGINT, sig_int_handler);
+  signal(SIGTERM, sig_int_handler);
+  signal(SIGKILL, sig_int_handler);
   all_args_t        args;
   metrics_stdout    metrics;
   enb              *enb = enb::get_instance();

srsepc/src/main.cc

@@ -259,6 +259,8 @@ main (int argc,char * argv[] )
 {  
   cout << endl <<"---  Software Radio Systems EPC  ---" << endl << endl;
   signal(SIGINT, sig_int_handler);
+  signal(SIGTERM, sig_int_handler);
+  signal(SIGKILL, sig_int_handler);
 
   all_args_t args;
   parse_args(&args, argc, argv); 

srsue/src/main.cc

@@ -425,6 +425,8 @@ int main(int argc, char *argv[])
 {
   srslte::metrics_hub<ue_metrics_t> metricshub;
   signal(SIGINT, sig_int_handler);
+  signal(SIGTERM, sig_int_handler);
+  signal(SIGKILL, sig_int_handler);
   all_args_t args;
 
   srslte_debug_handle_crash(argc, argv);