Per #2224, update existing parse_conf_nbrhd() function to skip parsin…

…g the field entry for the nbrhd_prob. This seems preferable to all the duplication involved in writing a new parse_conf_nbrhd_prob() function.

src/basic/vx_config/config_util.cc

@@ -1731,11 +1731,18 @@ NbrhdInfo parse_conf_nbrhd(Dictionary *dict, const char *conf_key) {
    nbrhd_dict = dict->lookup_dictionary(conf_key);
 
    // Conf: field - may be missing
-   v = nbrhd_dict->lookup_int(conf_key_field, false);
 
-   // If found, interpret value.  Otherwise, default to BOTH
-   if(nbrhd_dict->last_lookup_status()) info.field = int_to_fieldtype(v);
-   else                                 info.field = FieldType_Both;
+   // Default info.field to BOTH
+   info.field = FieldType_Both;
+
+   // Skip lookup for conf_key_nbrhd_prob
+   if(strncmp(conf_key, conf_key_nbrhd_prob, strlen(conf_key_nbrhd_prob)) != 0) {
+
+      v = nbrhd_dict->lookup_int(conf_key_field, false);
+
+      // If found, interpret value
+      if(nbrhd_dict->last_lookup_status()) info.field = int_to_fieldtype(v);
+   }
 
    // Conf: vld_thresh
    info.vld_thresh = nbrhd_dict->lookup_double(conf_key_vld_thresh);