BUG/MINOR: server-state: load SRV resolution only if params match the config

BUG/MINOR: server-state: load SRV resolution only if params match the config

When the state of a server is loaded, if there is no hostname defined for
this server and if a fqdn and a server record are retrieved from the state
file, it means the server should rely on a SRV resolution. But we must be
sure the server is configured this way. A SRV resolution must be configured
with the same SRV record. This part must be skipped if there is no SRV
resolution configured for this server or if the SRV record used is not the
same.

This patch should be backported as far as 1.8 after some observation period.