MdeModulePkg: Fix issue the iSCSI client can not send reset packet correctly.
    
    if we already established a iSCSI connection from initiator to target
    based on IPv4 stack, after using reconnect -r command, we can not rebuild
    the session with the windows target, since the server thought the session
    is still exist.  This issue is caused by wrong place of acquire ownership of
    sock lock which lead the iSCSI can not reset the connection correctly.
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
    Cc: Wu Jiaxin <jiaxin.wu@intel.com>
    Cc: Ye Ting <ting.ye@intel.com>
    Cc: Fu Siyuan <siyuan.fu@intel.com>
    Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>