upon cold reboot, skip remove mgmt vrf table from the kernel (#1214)

* upon cold reboot, skip remove mgmt vrf table from the kernel
Co-authored-by: Bing Sun <[email protected]>

Author: bsun-sudo

cfgmgr/vrfmgr.cpp

@@ -67,6 +67,14 @@ VrfMgr::VrfMgr(DBConnector *cfgDb, DBConnector *appDb, DBConnector *stateDb, con
                 }
                 else
                 {
+                    // No deletion of mgmt table from kernel
+                    if (vrfName.compare("mgmt") == 0)
+                    { 
+                        SWSS_LOG_NOTICE("Skipping remove vrf device %s", vrfName.c_str());
+                        rowType = LINK_ROW;
+                        break;
+                    }
+
                     SWSS_LOG_NOTICE("Remove vrf device %s", vrfName.c_str());
                     cmd.str("");
                     cmd.clear();