src: infer server IP when it has more than one IP address

infer server IP for a given client. User does not have to attach a client to
a given server IP anymore through ordenadores.identorno.

this simplifies previous work to allow a server to have more than one IP address

a0a347068285 ('#1074 rest: set_mode: add support for different ogserver addresses')
44745a3f2287 ('rest: add POST client/server method')

POST /client/server is removed, it is only used by ogcli and explicit association
between server and client is not required.

server_id json attribute is also removed in GET client/info.

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