az capi readme and minor updates (#342)

* az capi readme and minor updates

Signed-off-by: Mark Rossetti <marosset@microsoft.com>

* Update capz/run-capz-e2e.sh

Co-authored-by: James Sturtevant <jsturtevant@gmail.com>

Signed-off-by: Mark Rossetti <marosset@microsoft.com>
Co-authored-by: James Sturtevant <jsturtevant@gmail.com>