NetworkPkg:Generate the correct operational state of the interface.

NetworkPkg:Generate the correct operational state of the interface.

Currently, When there are more than 9 Ethernet ports available,
'ifconfig6 -l' is not listing all the ports, only show the ports 0 to 9.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Cc: Santhapur Naveen <naveens@amiindia.co.in>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>