fix: remove psutil and signal imports

Author: ranzvi

src/sagemaker/local/image.py

@@ -31,10 +31,7 @@
 import tempfile
 
 from distutils.spawn import find_executable
-from signal import SIGTERM
 from threading import Thread
-
-import psutil
 from six.moves.urllib.parse import urlparse
 
 import sagemaker