vpd-tool:Fix system VPD and its backup VPD

vpd-tool fixSystemVPD implementation to backup and restore system VPD
to and from the backup VPD if the backup VPD path is found in
vpd inventory JSON.

Test:
(Truncating the output in commit message)

===>>CASE 1: Option 6 to update new value on both backup and primary
hardware and its cache.

vpd-tool --fixSystemVPD
=============================================================
S.No  Record  Keyword  Backup Data  Primary Data    Data Mismatch
1     UTIL    D0       0x01         0x01            NO
============================================================

>> Enter the new value to update on both primary & backup. Value should be in ASCII or in HEX(prefixed with 0x) : 0x00

busctl get-property xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard/base_op_panel_blyth com.ibm.ipzvpd.VSBK D0
ay 1 0

busctl get-property xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard com.ibm.ipzvpd.UTIL D0
ay 1 0

===>>CASE 2: Option 4 to update primary with backup data

vpd-tool -w -O /system/chassis/motherboard -R LXR0 -K LX -V 0x333435363738
Data updated successfully

vpd-tool --fixSystemVPD
=================================================================================
S.No  Record  Keyword  Backup Data            Primary Data           Data Mismatch
6     LXR0    LX       0x310004010030007b     0x333435363738007b     YES
=================================================================================

Enter 4 => If you choose the data on backup as the right value : 4

busctl get-property xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard com.ibm.ipzvpd.LXR0 LX
ay 8 49 0 4 1 0 48 0 123

===>>CASE 3: Option 5 to update backup with primary value
vpd-tool -w -O /system/chassis/motherboard/base_op_panel_blyth -R VSBK -K FC -V "abcd"
Data updated successfully

vpd-tool --fixSystemVPD
=================================================================================
S.No  Record  Keyword  Backup Data            Primary Data           Data Mismatch
7     VCEN    FC       0x616263642d303031     0x324534412d303031     YES
=================================================================================

Enter 5 => If you choose the data on primary as the right value : 5

busctl get-property xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard/base_op_panel_blyth com.ibm.ipzvpd.VSBK FC
ay 8 50 69 52 65 45 48 48 49

===>>CASE 4: Option 2 to update all mismatching keywords with its primary data

vpd-tool -w -O /system/chassis/motherboard/base_op_panel_blyth -R VSBK -K FC -V "abcd"
Data updated successfully

vpd-tool -w -O /system/chassis/motherboard/base_op_panel_blyth -R VSBK -K D0 -V "abcd"
Data updated successfully

vpd-tool --fixSystemVPD
=================================================================================
S.No  Record  Keyword  Backup Data            Primary Data           Data Mismatch
=================================================================================
1     UTIL    D0       0x61                   0x01                   YES
-------------------------------------------------------------------------------
7     VCEN    FC       0x616263642d303031     0x324534412d303031     YES
=================================================================================

Enter 2 => If you choose the data on primary for all mismatching record-keyword pairs : 2

Data updated successfully for all mismatching record-keyword pairs by choosing their corresponding data from primary VPD.

vpd-tool -r -O /system/chassis/motherboard/base_op_panel_blyth -R VSBK -K FC
{
    "/system/chassis/motherboard/base_op_panel_blyth": {
        "FC": "2E4A-001"
    }
}
vpd-tool -r -O /system/chassis/motherboard/base_op_panel_blyth -R VSBK -K D0
{
    "/system/chassis/motherboard/base_op_panel_blyth": {
        "D0": "0x01"
    }
}

===>>CASE 5: Option 1

vpd-tool -w -O /system/chassis/motherboard -R UTIL -K D0 -V "abcd"
Data updated successfully
vpd-tool -w -O /system/chassis/motherboard -R UTIL -K D1 -V "abcd"
Data updated successfully

vpd-tool --fixSystemVPD
=================================================================================
S.No  Record  Keyword  Backup Data            Primary Data           Data Mismatch
=================================================================================
1     UTIL    D0       0x01                   0x61                   YES
-------------------------------------------------------------------------------
2     UTIL    D1       0x00                   0x61                   YES
=================================================================================

Enter 1 => If you choose the data on backup for all mismatching record-keyword pairs: 1

Data updated successfully for all mismatching record-keyword pairs by choosing their corresponding data from backup. Exit successfully.

vpd-tool -r -O /system/chassis/motherboard  -R UTIL -K D0
{
    "/system/chassis/motherboard": {
        "D0": "0x01"
    }
}
vpd-tool -r -O /system/chassis/motherboard  -R UTIL -K D1
{
    "/system/chassis/motherboard": {
        "D1": "0x00"
    }
}

Change-Id: I0cfa5c869d4c44d2dd74916b5284fa2ad9b4f398
Signed-off-by: Priyanga Ramasamy <priyanga24@in.ibm.com>
diff --git a/vpd_tool.cpp b/vpd_tool.cpp
index 9bad631..911ce7f 100644
--- a/vpd_tool.cpp
+++ b/vpd_tool.cpp
@@ -199,8 +199,20 @@
         }
         else if (*fixSystemVPDFlag)
         {
+            std::string backupEepromPath;
+            std::string backupInvPath;
+            findBackupVPDPaths(backupEepromPath, backupInvPath, jsObject);
             VpdTool vpdToolObj;
-            rc = vpdToolObj.fixSystemVPD();
+
+            if (backupEepromPath.empty())
+            {
+                rc = vpdToolObj.fixSystemVPD();
+            }
+            else
+            {
+                rc = vpdToolObj.fixSystemBackupVPD(backupEepromPath,
+                                                   backupInvPath);
+            }
         }
         else if (*mfgClean)
         {