Baseline Firmware_NVR(-K2/K4 series)_ML_STD_V3.4.92 170228

Support Models: DS-7608/7616NI-K2, DS-7608/7616NI-K2/8P(16P), DS-7716/7732NI-K4, DS-7716/7732NI-K4/16P

Main Updates: 1. Remove HiDDNS, IPServer; 2. Newly add Hik-Connect service, support Hik-Connect domain and alarm push service; 3. Hik-Connect is disabled as default 4. Verification code creation required when enable Hik-Connect service at the first time; 5. Other changes