Make this a proper python package.

Python is picky about directory structure. Ever since python 3 the tests
have not been able to run because the import won't work. This fixes that
problem.

Bug: None
Test: None
Change-Id: I4a626f130e4ca3cd2c9b69804083dfe6daffb5f7

python-packages/adb/setup.py

@@ -22,7 +22,6 @@ setup(
     description='A Python interface to the Android Debug Bridge.',
     license='Apache 2.0',
     keywords='adb android',
-    package_dir={'adb': ''},
     packages=['adb'],
     package_data={'adb': ['py.typed']},
     classifiers=[