Improve sdist and bdist packaging

* Include tests in sdist
* Include license and notices in all distributions
* Update manifest
* Use more conventional file names for licenses, notices, etc.

related to https://github.com/vmware/pyvmomi/issues/133
related to https://github.com/vmware/pyvmomi/issues/123

closes: https://github.com/vmware/pyvmomi/issues/139

MANIFEST.in

@@ -1,4 +1,5 @@
-include README.md
-include requirements.txt
-include test-requirements.txt
+include README.*
+include *.txt
+include setup.py
+recursive-include tests *
 recursive-include sample *

setup.py

@@ -36,6 +36,8 @@ setup(
    packages=['pyVmomi', 'pyVim'],
    install_requires=required,
    license='License :: OSI Approved :: Apache Software License',
+   data_files = [("", ["LICENSE.txt", "NOTICE.txt", "MANIFEST.in",
+                       "setup.py"])],
    # NOTE: pypi prefers the use of RST to render docs
    long_description=read('README.rst'),
    classifiers=[