fixed the default values for def.server when not given

runtime/include/tenant_config.h

@@ -73,19 +73,19 @@ tenant_config_validate(struct tenant_config *config, bool *did_set)
 
 	if (scheduler == SCHEDULER_MTDS) {
 		if (did_set[tenant_config_member_replenishment_period_us] == false) {
-			fprintf(stderr, "replenishment-period-us field is required\n");
-			return -1;
+			fprintf(stderr, "replenishment-period-us field is missing, so defaulting to 0\n");
+			config->replenishment_period_us = 0;
 		}
 
 		if (config->replenishment_period_us > (uint32_t)RUNTIME_RELATIVE_DEADLINE_US_MAX) {
-			fprintf(stderr, "Relative-deadline-us must be between 0 and %u, was %u\n",
+			fprintf(stderr, "relative-deadline-us must be between 0 and %u, was %u\n",
 			        (uint32_t)RUNTIME_RELATIVE_DEADLINE_US_MAX, config->replenishment_period_us);
 			return -1;
 		}
 
 		if (did_set[tenant_config_member_max_budget_us] == false) {
-			fprintf(stderr, "max-budget-us field is required\n");
-			return -1;
+			fprintf(stderr, "max-budget-us field is missing, so defaulting to 0\n");
+			config->max_budget_us = 0;
 		}
 
 		if (config->max_budget_us > (uint32_t)RUNTIME_RELATIVE_DEADLINE_US_MAX) {