NetworkPkg:Add scriptable configuration to iSCSI driver by leveraging x-UEFI.

v2:
Add error handling if can not create Attempts in driver entry point.
Since we support to define a macro be a PCD value, we enhance our code
by modifying the structure in IFR_NVDATA. This effect code logic mainly
in Creating Keywords,Convert IFR NvData To AttemptConfigData ByKeyword and
reverse function.
Fix typo errors and sync based on the latest code.

Enable iSCSI keywords configuration based on x-UEFI
name space. we introduce new PCD to control the attempt
numbers which will be created in non activated state, besides
the Attempt name is changed to READ_ONLY attribute in UI.
We can invoke KEYWORD HANDLER Protocol to configure
the related keywords.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Wu Jiaxin jiaxin.wu@intel.com

NetworkPkg/IScsiDxe/IScsiMisc.h

@@ -243,6 +243,44 @@ IScsiRemoveNic (
   IN EFI_HANDLE  Controller
   );
 
+/**
+  Create and initialize the Attempts.
+
+  @param[in]  AttemptNum          The number of Attempts will be created.
+
+  @retval EFI_SUCCESS             The Attempts have been created successfully.
+  @retval Others                  Failed to create the Attempt.
+
+**/
+EFI_STATUS
+IScsiCreateAttempts (
+  IN UINTN            AttemptNum
+  );
+
+/**
+  Create the iSCSI configuration Keywords for each attempt.
+
+  @param[in]  KeywordNum          The number Sets of Keywords will be created.
+
+  @retval EFI_SUCCESS             The operation is completed.
+  @retval Others                  Failed to create the Keywords.
+
+**/
+EFI_STATUS
+IScsiCreateKeywords (
+  IN UINTN            KeywordNum
+  );
+
+/**
+
+  Free the attempt configure data variable.
+
+**/
+VOID
+IScsiCleanAttemptVariable (
+  IN   VOID
+  );
+
 /**
   Get the recorded NIC information from a global structure by the Index.