[Supervisor][fabric] Modify the deinit function not to remove CHASSIS…

…_FABRIC_ASIC_TABLE when supervisorctl stop chassisd (#340)

Code changes are implemented in deinit function such that it does not remove entries in CHASSI_FABRIC_ASIC_TABLE when supervisorctl stop chassisd is triggered.

sonic-chassisd/scripts/chassisd

@@ -208,9 +208,10 @@ class ModuleUpdater(logger.Logger):
             self.chassis_table._del(CHASSIS_INFO_KEY_TEMPLATE.format(1))
 
         if self.asic_table is not None:
-            asics = list(self.asic_table.getKeys())
-            for asic in asics:
-                self.asic_table._del(asic)
+            if not self._is_supervisor():
+                asics = list(self.asic_table.getKeys())
+                for asic in asics:
+                    self.asic_table._del(asic)
 
     def modules_num_update(self):
         # Check if module list is populated

sonic-chassisd/tests/test_chassisd.py

@@ -449,10 +449,8 @@ def verify_fabric_asic(asic_name, asic_pci_address, module_name, asic_id_in_modu
     midplane_table = module_updater.midplane_table
     fvs = midplane_table.get(name)
     assert fvs == None
-    fvs = fabric_asic_table.get("asic4")
-    assert fvs == None
-    fvs = fabric_asic_table.get("asic5")
-    assert fvs == None
+    verify_fabric_asic("asic4", "0000:04:00.0", name, "0")
+    verify_fabric_asic("asic5", "0000:05:00.0", name, "1")
 
 def test_signal_handler():
     exit_code = 0