For both IPv4 and IPv6, when network transfer failed, such as disconnected cable or disable http server, HTTP boot should exit back to the menu UI rather than hang. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Zhang Lubo <lubo.zhang@intel.com> Reviewed-by: Ye Ting <ting.ye@intel.com> Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19335 6f19259b-4bc3-4df7-8a09-765794883524