skip endpoint discovery

[DanNiESh]

This PR adds the logic to skip esi-leap endpoint discovery, so that esisdk won't make call to http://129.10.5.142:7777 at first to obtain the endpoint url.

[tzumainn]

oh, interesting! is this code also somewhere in the openstack codebase?

[DanNiESh]

oh, interesting! is this code also somewhere in the openstack codebase?

Yeah, i found it here: https://github.com/openstack/openstacksdk/blob/ff2d0a5bd0b929d5fc15e5b0cfabe2b57a33f722/openstack/service_description.py#L254. But when I directly used the code here, it made call to http://129.10.5.142:7777/leases/ rather than http://129.10.5.142:7777/v1/leases/, so i restricted the endpoint url to be '{}/v{}'.format(ep_override, version_string)`

[tzumainn]

looks good - thanks!