netcmd: enable IPv6 config option
netcmd: enable IPv6 config option

This commit is to enable IPv6 config option.

Change-Id: I1210f65d6b0d211a78c8718ee99673f132b756eb
Signed-off-by: Changsoon Kim <c1120524009612ae00648f6848418e342ca4bc0a@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT