NetworkPkg: Fix the HttpCloseConnection fail issue

NetworkPkg: Fix the HttpCloseConnection fail issue

When HTTP server is unavailable,HttpCloseConnection will enter
infinite loop to wait for TCP4->close Event return, So we need to
decide the Http Instance state whether in the appropriate state
before close it.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@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@18400 6f19259b-4bc3-4df7-8a09-765794883524