Liberalize version matching a bit

For class-loading purposes we can just use the major version,
so accept that. Only Identity and Compute were affected; Compute
is included just to be pedantically complete.

Change the internal default for Identity to a simple '2' so it
is also consistent with the rest of the world.

Then comes microversioning...

Closes-Bug: #1292638
Change-Id: Ibaf823b31caa288a83de38d2c258860b128b87d8
Add an API example base and functional test base

Add examples/common.py, which is a basic common setup that mimics OSC's
configuration options and logging without the rest of the CLI.

Also add the functional test tooling for examples to prevent bit rot.

Co-Authored-By: Dean Troyer <dtroyer@gmail.com>
Change-Id: Ie92b675eafd93482ddc9a8ce0b0588e23ed50c35
Add more session/api examples

* examples/object_api.py - Example of using the Object_Store API
* examples/osc-lib.py - Minimal client to use ClientManager as a library

Also add matching functional tests

Change-Id: I4243a21141a821420951d4b6352d41029cdcccbc
Merge branch 'func-tests-examples' into dt-test
Merge branch 'low-level-api-network' into dt-test