With kirr/neo!3 we changed the NEO
scheme from

    neo(s)://[credentials@]master1,master2,...,masterN/name?options

to

    neo(s)://[credentials@]master1,master2,...,masterN/name?server_options#client_options

This change needs to be applied to the NEO URL constructor in SlapOS which
parses the URL to wendelin.core. Furthermore this patch drops SlapOS
NEO options, which don't belong to NEO API options (_ca, _key, _cert [1]),
in order to stabilize WCFS.

[1] https://lab.nexedi.com/nexedi/slapos/blob/8e6f4101/software/neoppod/instance-neo-input-schema.json#L62