* always disable fiu in milvus_server and enable in unittest, make it work in config directory
Signed-off-by: NWang Xiangyu <xy.wang@zilliz.com>

* always enable fiu to keeping behavior
Signed-off-by: NWang Xiangyu <xy.wang@zilliz.com>

* always enable fiu to keeping behavior
Signed-off-by: NWang Xiangyu <xy.wang@zilliz.com>