MINOR: resolvers: Directly call srvrq_update_srv_state() when possible

MINOR: resolvers: Directly call srvrq_update_srv_state() when possible

When the server status must be updated from the result of a SRV resolution,
we can directly call srvrq_update_srv_state(). It is simpler and this avoid
a test on the server DNS resolution.

This patch is mandatory for the next commit. It also rely on "MINOR:
resolvers: Directly call srvrq_update_srv_state() when possible".

(cherry picked from commit 6b117aed492d9916a5c656b4fbfcac6159133c0f)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>