child-cfg: Generalize get_ke_method() method

src/libcharon/sa/ikev1/tasks/quick_mode.c

@@ -866,7 +866,8 @@ METHOD(task_t, build_i, status_t,
 				return FAILED;
 			}
 
-			group = this->config->get_ke_method(this->config);
+			group = this->config->get_algorithm(this->config,
+												KEY_EXCHANGE_METHOD);
 			if (group != KE_NONE)
 			{
 				proposal_t *proposal;

src/libcharon/sa/ikev2/tasks/child_create.c

@@ -1160,7 +1160,8 @@ METHOD(task_t, build_i, status_t,
 			}
 			if (!this->retry && this->dh_group == KE_NONE)
 			{	/* during a rekeying the group might already be set */
-				this->dh_group = this->config->get_ke_method(this->config);
+				this->dh_group = this->config->get_algorithm(this->config,
+														KEY_EXCHANGE_METHOD);
 			}
 			break;
 		case IKE_AUTH: