NetworkPkg: Report Http Errors to screen when http layer occurs an error

NetworkPkg: Report Http Errors to screen when http layer occurs an error

Http server will return error status in http header when http connection
cannot be established,so the http boot driver should print the error code
code to the screen and the users can know what happened.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Reviewed-by: Sriram Subramanian <sriram-s@hpe.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18761 6f19259b-4bc3-4df7-8a09-765794883524