oeqa/runtime: load modules using importlib

Instead of using __import__() which is low-level and discouraged, use
importlib.

(From OE-Core rev: 9f501d22eab5dbd565f3f5783f4f484a6d1f70a2)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/context.py

@@ -175,16 +175,12 @@ class OERuntimeTestContextExecutor(OETestContextExecutor):
     # Search for and return a controller or None from given module name
     @staticmethod
     def _loadControllerFromModule(target, modulename):
-        obj = None
-        # import module, allowing it to raise import exception
-        module = __import__(modulename, globals(), locals(), [target])
-        # look for target class in the module, catching any exceptions as it
-        # is valid that a module may not have the target class.
         try:
-            obj = getattr(module, target)
-        except:
-            obj = None
-        return obj
+            import importlib
+            module = importlib.import_module(modulename)
+            return getattr(module, target)
+        except AttributeError:
+            return None
 
     @staticmethod
     def readPackagesManifest(manifest):