[show][config][plugin] add processing of ModuleNotFoundError with warning log message instead of default error message

    Avoid excess error messages for cases of race conditions when plugin was
    removed right before the stage of its loading

    Signed-off-by: Maksym Kovalchuk <mkovalchuk@nvidia.com>

Author: maksym-kovalchuk

utilities_common/util_base.py

@@ -30,6 +30,11 @@ def iter_namespace(ns_pkg):
             try:
                 module = importlib.import_module(module_name)
             except Exception as err:
+                if isinstance(err, ModuleNotFoundError):
+                    log.log_warning('failed to import plugin {}: {}'.format(module_name, err),
+                                    also_print_to_console=True)
+                    continue
+
                 log.log_error('failed to import plugin {}: {}'.format(module_name, err),
                               also_print_to_console=True)
                 continue