test

vSphere 6.7 Release Updated (#670)

* Merging changes from Gitlab to Github

* Update setup.py

* Fix ManagedType methods broken due to removal of unstable version

* Disabling test for 6.7

Updating vSphere Web Service 6.7 API reference url

Add more telemetry info to pyvmomi client

Add more info to header for pyvmomi client.
After the change the user agent will be:

'pyvmomi Python/3.6.3 (Windows; 10; AMD64)'
'pyvmomi Python/2.7.8 (Linux; 2.6.32-642.6.2.el6.x86_64; x86_64)'
'pyvmomi Python/3.6.2 (Darwin; 15.6.0; x86_64)'

Signed-off-by: Tianhao He <het@vmware.com>

Fix vSphere 6.7 bindings