Make some mib real

Signed-off-by: leo-ma <begeekmyfriend@gmail.com>
Fix tcp connection status type bug

Signed-off-by: leo-ma <begeekmyfriend@gmail.com>
Add icmp group

Signed-off-by: leo-ma <begeekmyfriend@gmail.com>
Merge pull request #42 from leo-ma/real_mib

Make some MIB group(udp,tcp.ip) real.