Fix alerts founded the LGTM system and add LGTM configuration file

Signed-off-by: Taras Drozdovskyi <t.drozdovsky@samsung.com>

lgtm.yml

@@ -0,0 +1,3 @@
+queries:
+    - exclude: py/unused-import
+    - exclude: py/polluting-import

src/controller/python/chip/ChipDeviceCtrl.py

@@ -392,11 +392,11 @@ def DeviceAvailableCallback(device, err):
 
         # The callback might have been received synchronously (during self._ChipStack.Call()).
         # Check if the device is already set before waiting for the callback.
-        if returnDevice.value == None:
+        if returnDevice.value is None:
             with deviceAvailableCV:
                 deviceAvailableCV.wait()
 
-        if returnDevice.value == None:
+        if returnDevice.value is None:
             raise self._ChipStack.ErrorToException(CHIP_ERROR_INTERNAL)
         return returnDevice
 

src/controller/python/chip/ChipReplStartup.py

@@ -41,7 +41,7 @@ def ReplInit():
 
 
 def matterhelp(classOrObj=None):
-    if (classOrObj == None):
+    if (classOrObj is None):
         inspect(builtins.devCtrl, methods=True, help=True, private=False)
         inspect(mattersetlog)
         inspect(mattersetdebug)

src/controller/python/chip/clusters/Command.py

@@ -74,7 +74,7 @@ def _handleResponse(self, path: CommandPath, status: Status, response: bytes):
             self._future.set_result(None)
         else:
             # If a type hasn't been assigned, let's auto-deduce it.
-            if (self._expect_type == None):
+            if (self._expect_type is None):
                 self._expect_type = FindCommandClusterObject(False, path)
 
             if self._expect_type:

src/controller/python/chip/interaction_model/__init__.py

@@ -26,7 +26,7 @@
 
 from chip.exceptions import ChipStackException
 
-__all__ = ["IMDelegate", "Status", "InteractionModelError"]
+__all__ = ["Status", "InteractionModelError"]
 
 
 class Status(enum.IntEnum):