add config IF:  get device state

1. add interface： MVDGetState;
2. add request in MICOConfigServer:
URL:  "/dev-state"
3. use new productId/productKey(short).
update EasyCloud lib to version v0.2.5

EasyCloud  v0.2.5:
1. add topic len;
2. fix get_rom_version function return bug.