Refactor getAssociationEndPoints method

Since the getAssociationEndPoints method has been implemented in
dbus_utility and this commit is to integrate all the places where the
endpoints attribute is obtained, and use the method in dbus_utility
uniformly.

Tested:
1. Redfish Validator Passed
2. For all the endpoints we changed, we got the same result as before

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I91a5e80de5bc3b5712c2d5b81f2f8b982d1c884e
diff --git a/redfish-core/lib/storage.hpp b/redfish-core/lib/storage.hpp
index 5f3ccd3..0388ccd 100644
--- a/redfish-core/lib/storage.hpp
+++ b/redfish-core/lib/storage.hpp
@@ -702,12 +702,11 @@
             asyncResp->res.jsonValue["Name"] = "Drive Collection";
 
             // Association lambda
-            sdbusplus::asio::getProperty<std::vector<std::string>>(
-                *crow::connections::systemBus,
-                "xyz.openbmc_project.ObjectMapper", path + "/drive",
-                "xyz.openbmc_project.Association", "endpoints",
-                [asyncResp, chassisId](const boost::system::error_code& ec3,
-                                       const std::vector<std::string>& resp) {
+            dbus::utility::getAssociationEndPoints(
+                path + "/drive",
+                [asyncResp,
+                 chassisId](const boost::system::error_code& ec3,
+                            const dbus::utility::MapperEndPoints& resp) {
                 if (ec3)
                 {
                     BMCWEB_LOG_ERROR << "Error in chassis Drive association ";
@@ -867,13 +866,11 @@
                 continue;
             }
 
-            sdbusplus::asio::getProperty<std::vector<std::string>>(
-                *crow::connections::systemBus,
-                "xyz.openbmc_project.ObjectMapper", path + "/drive",
-                "xyz.openbmc_project.Association", "endpoints",
+            dbus::utility::getAssociationEndPoints(
+                path + "/drive",
                 [asyncResp, chassisId,
                  driveName](const boost::system::error_code& ec3,
-                            const std::vector<std::string>& resp) {
+                            const dbus::utility::MapperEndPoints& resp) {
                 if (ec3)
                 {
                     return; // no drives = no failures