Fixed bug with acts missing __init__.py crashing uninstall

If the acts module does not have an __init__.py file in its root
directory then the __file__ attribute will not exist. The __path__
attribute will always exist and is safer to use.

Bug: 32755078
Test: Ran uninstaller to see that it still worked.
Change-Id: I392ec655265cca048d58b72808b05b991af4db14
diff --git a/acts/framework/setup.py b/acts/framework/setup.py
index 51fa13d..3ec3d9b 100755
--- a/acts/framework/setup.py
+++ b/acts/framework/setup.py
@@ -109,10 +109,9 @@
         Args:
             acts_module: The acts module to uninstall.
         """
-        acts_install_dir = os.path.dirname(acts_module.__file__)
-
-        self.announce('Deleting acts from: %s' % acts_install_dir, log.INFO)
-        shutil.rmtree(acts_install_dir)
+        for acts_install_dir in acts_module.__path__:
+            self.announce('Deleting acts from: %s' % acts_install_dir, log.INFO)
+            shutil.rmtree(acts_install_dir)
 
     def run(self):
         """Entry point for the uninstaller."""