Continue to refactor autoserv to build client test at run time.

client/bin/base_utils.py

Index: client/bin/base_utils.py
diff --git a/client/bin/base_utils.py b/client/bin/base_utils.py
index 96d1fc06fa4f616433bae03cff85ec0053cb4279..7c5d26b11996363277180757c9049b9559b95cd1 100644
--- a/client/bin/base_utils.py
+++ b/client/bin/base_utils.py
@@ -63,7 +63,10 @@ def extract_tarball_to_dir(tarball, dir):
     the top level of a tarball is - useful for versioned directory names, etc
     """
     if os.path.exists(dir):
-        raise NameError, 'target %s already exists' % dir
+      if os.path.isdir(dir):
+        shutil.rmtree(dir)
+      else:
+        os.remove(dir)
     pwd = os.getcwd()
     os.chdir(os.path.dirname(os.path.abspath(dir)))
     newdir = extract_tarball(tarball)