NetworkPkg: Display HTTP redirection info to the screen if need.

HTTP defines a set of status code for redirecting a request to a different URI
in Section 6.4 of RFC7231 and also RFC7583. This patch updates the HTTP boot
driver to display the redirection info to the screen so the user would have
chance to know new URI address of the HTTP boot image.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>

NetworkPkg/HttpBootDxe/HttpBootSupport.h

@@ -445,4 +445,17 @@ HttpBootRegisterRamDisk (
   IN  VOID                         *Buffer,
   IN  HTTP_BOOT_IMAGE_TYPE         ImageType
   );
+
+/**
+  Indicate if the HTTP status code indicates a redirection.
+  
+  @param[in]  StatusCode      HTTP status code from server.
+
+  @return                     TRUE if it's redirection.
+
+**/
+BOOLEAN
+HttpBootIsHttpRedirectStatusCode (
+  IN   EFI_HTTP_STATUS_CODE        StatusCode
+ );
 #endif