Fix import_path circular dependency by splitting it out.

Use import thread_pool instead from, from is evil.

Fix poweroff.out path for ./trace-boot.

lkmc/import_path.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+
+import importlib
+import os
+import sys
+
+root_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+def import_path(path):
+    '''
+    https://stackoverflow.com/questions/2601047/import-a-python-module-without-the-py-extension
+    https://stackoverflow.com/questions/31773310/what-does-the-first-argument-of-the-imp-load-source-method-do
+    '''
+    module_name = os.path.basename(path).replace('-', '_')
+    spec = importlib.util.spec_from_loader(
+        module_name,
+        importlib.machinery.SourceFileLoader(module_name, path)
+    )
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    sys.modules[module_name] = module
+    return module
+
+def import_path_relative_root(basename):
+    return import_path(os.path.join(root_dir, basename))
+
+def import_path_main(basename):
+    '''
+    Import an object of the Main class of a given file.
+
+    By convention, we call the main object of all our CLI scripts as Main.
+    '''
+    return import_path_relative_root(basename).Main()