Merge branch 'fix_sst_conf_file' into 'develop'

Update SST type (int instead of string) in conf file

See merge request oai/cn5g/oai-cn5g-amf!164

etc/amf.conf

@@ -49,9 +49,9 @@ AMF =
   {
     MCC = "@PLMN_SUPPORT_MCC@"; MNC = "@PLMN_SUPPORT_MNC@"; TAC = @PLMN_SUPPORT_TAC@;  
     SLICE_SUPPORT_LIST = (
-      {SST = "@SST_0@"; SD = "@SD_0@"},  
-      {SST = "@SST_1@"; SD = "@SD_1@"}, 
-      {SST = "@SST_2@"; SD = "@SD_2@"}   
+      {SST = @SST_0@; SD = "@SD_0@"},  
+      {SST = @SST_1@; SD = "@SD_1@"}, 
+      {SST = @SST_2@; SD = "@SD_2@"}   
      )
   }
   );

src/amf-app/amf_config.cpp

@@ -217,13 +217,13 @@ int amf_config::load(const std::string& config_file) {
       for (int j = 0; j < numOfSlice; j++) {
         slice_t slice;
         const Setting& slice_item = slice_list_cfg[j];
-        std::string sst           = {};
+        unsigned int sst          = 0;
         std::string sd            = {};
         slice_item.lookupValue(AMF_CONFIG_STRING_SST, sst);
+        slice.sst = sst;
         slice_item.lookupValue(AMF_CONFIG_STRING_SD, sd);
         slice.sd = SD_NO_VALUE;  // Default value
         try {
-          slice.sst = std::stoi(sst);
           conv::sd_string_to_int(sd, slice.sd);
         } catch (const std::exception& err) {
           Logger::amf_app().error("Invalid SST/SD");