Updated openstack/openstack
Project: openstack/oslo.vmware  05ef356b3d6f2a63c29ceb1a639624de65b586e7

Add support for using extensions

This patch registers an extension in vCenter. This enables a third
party, for example OpenStack, to mark that it is responsible for a
resource.

If an administrator tries to update the VM via vCenter then they will
get the following message:

"Solution OpenStack manages the selected virtual machine. You should
not modify the virtual machine directly. Use the management console of
the solution to make changes. Do you want to proceed?"

The following API's have been added:
 - find_extension - checks if a specific extension exists
 - register_extension - registers a new extension

Note that the onus is on the caller to validate that the extension exists.
If not they should handle the exception returned from the backend.

The pseudo code should be as follows:

    if not find_extension(key):
        register_extension(...)

Change-Id: I634b84da8bf32fab6152af3c84ed1bb8c52251af