Refactor : Add a helper function to addFruObjectToDbus

Refactoring addFruObjectToDbus function and created a new helper
function getProductName. Moved this function to fru_utils.cpp as
it is common for all fru-device deamons and avoid code duplication.

This patch is created based on suggestion on the below patch.
https://gerrit.openbmc.org/c/openbmc/entity-manager/+/51555

TESTED : Built Facebook YosemiteV2 images and loaded
on the target hardware. Verified all the fru's read and write.

Signed-off-by: Kumar Thangavel <thangavel.k@hcl.com>
Change-Id: I272d2fd2fc664a471774c668503d87147eb80a54
diff --git a/src/fru_device.cpp b/src/fru_device.cpp
index c4272cb..26ac516 100644
--- a/src/fru_device.cpp
+++ b/src/fru_device.cpp
@@ -657,40 +657,16 @@
     std::shared_ptr<sdbusplus::asio::connection>& systemBus)
 {
     boost::container::flat_map<std::string, std::string> formattedFRU;
-    resCodes res = formatIPMIFRU(device, formattedFRU);
-    if (res == resCodes::resErr)
+
+    std::optional<std::string> optionalProductName = getProductName(
+        device, formattedFRU, bus, address, unknownBusObjectCount);
+    if (!optionalProductName)
     {
-        std::cerr << "failed to parse FRU for device at bus " << bus
-                  << " address " << address << "\n";
+        std::cerr << "getProductName failed. product name is empty.\n";
         return;
     }
-    if (res == resCodes::resWarn)
-    {
-        std::cerr << "there were warnings while parsing FRU for device at bus "
-                  << bus << " address " << address << "\n";
-    }
 
-    auto productNameFind = formattedFRU.find("BOARD_PRODUCT_NAME");
-    std::string productName;
-    // Not found under Board section or an empty string.
-    if (productNameFind == formattedFRU.end() ||
-        productNameFind->second.empty())
-    {
-        productNameFind = formattedFRU.find("PRODUCT_PRODUCT_NAME");
-    }
-    // Found under Product section and not an empty string.
-    if (productNameFind != formattedFRU.end() &&
-        !productNameFind->second.empty())
-    {
-        productName = productNameFind->second;
-        std::regex illegalObject("[^A-Za-z0-9_]");
-        productName = std::regex_replace(productName, illegalObject, "_");
-    }
-    else
-    {
-        productName = "UNKNOWN" + std::to_string(unknownBusObjectCount);
-        unknownBusObjectCount++;
-    }
+    std::string productName = optionalProductName.value();
 
     std::optional<int> index = findIndexForFRU(dbusInterfaceMap, productName);
     if (index.has_value())