MdeModulePkg CapsuleApp: Add directory support

Current CapsuleApp only supports input/output file from rootdirectory.
If the CapsuleApp and related file are put into subdirectory,
below message will be shown when running the CapsuleApp in shell.

"CapsuleApp: capsule image (Capsule image file name) is not found."

This patch is to add directory support for CapsuleApp
by using shell protocol.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

MdeModulePkg/Application/CapsuleApp/CapsuleApp.inf

@@ -4,7 +4,7 @@
 # This application can trigger capsule update process. It can also
 # generate capsule image, or dump capsule variable information.
 #
-#  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
 #  which accompanies this distribution.  The full text of the license may be found at
@@ -40,8 +40,6 @@
   MdeModulePkg/MdeModulePkg.dec
 
 [Guids]
-  gEfiFileInfoGuid                       ## CONSUMES   ## GUID
-  gEfiPartTypeSystemPartGuid             ## CONSUMES   ## GUID
   gEfiGlobalVariableGuid                 ## CONSUMES   ## GUID
   gEfiCapsuleReportGuid                  ## CONSUMES   ## GUID
   gEfiFmpCapsuleGuid                     ## CONSUMES   ## GUID
@@ -51,11 +49,10 @@
   gEfiSystemResourceTableGuid            ## CONSUMES   ## GUID
 
 [Protocols]
-  gEfiLoadedImageProtocolGuid            ## CONSUMES
-  gEfiSimpleFileSystemProtocolGuid       ## CONSUMES
   gEfiGraphicsOutputProtocolGuid         ## CONSUMES
   gEfiFirmwareManagementProtocolGuid     ## CONSUMES
   gEfiShellParametersProtocolGuid        ## CONSUMES
+  gEfiShellProtocolGuid                  ## CONSUMES
 
 [LibraryClasses]
   BaseLib