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v2: * A. Refine the code to make it more readable. * B. Add hint message for link local address case. This patch is used to support no source IP specified case while multiple NICs existed in the platform. The command will select the first both connected and configured interface automatically. Note: Source address is always required when pinging a link-local address. Cc: David Van Arnem <dvanarnem@cmlab.biz> Cc: Bhupesh Sharma <bhupesh.sharma@nxp.com> Cc: Jaben Carsey <jaben.carsey@intel.com> Cc: Ye Ting <ting.ye@intel.com> Cc: Fu Siyuan <siyuan.fu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com> Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>