Cleanup requirements.txt so we don't have to maintain separate copies for py2 and py3.

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

setup.py

@@ -41,9 +41,7 @@ install_requires = [
 
 
 tests_require = [
-    'mock >= 1.0.1',
     'nose',
-    'pyinstaller',
     'flake8',
 ]
 
@@ -51,7 +49,6 @@ tests_require = [
 if sys.version_info < (2, 7):
     tests_require.append('unittest2')
 if sys.version_info[:1] < (3,):
-    tests_require.append('pyinstaller')
     tests_require.append('mock >= 1.0.1')