slapproxy: Add minimal hateoas support for cli
Add the minimum hateoas support required to let slapproxy
answer the cli commands:
slapos service list
slapos service info <reference>
slapos computer list
slapos computer info <reference>
To enable hateoas, complete the slapos.cfg
configuration with:
[slapos]
master_rest_url = <proxyaddr>/hateoas
Also: fix a few small bugs and python3 incompatibilities in slap/hateoas
.