Set error status in mib item query

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>
New method for calling MIB handler in lua from C.

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>
Clear warning.

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>
Merge mibs with openwrt branch.

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>
Regenerate group index table in each mib node access.

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>