[redis] return fqdn for sentinel replicas lookup (#700)

[raouf-haddada]

• [redis] use fqdn for sentinel redis replicas, to avoid problems when calling it cross namespaces
  recognized replicas fqdn

$ redis-cli -p 26379 -h redis-cloud-pirates-headless.redis
redis-cloud-pirates-headless.redis:26379> sentinel replicas redis-master
1)  1) "name"
    2) "redis-cloud-pirates-2.redis-cloud-pirates-headless.redis.svc.cluster.local:6379"
    3) "ip"
    4) "redis-cloud-pirates-2.redis-cloud-pirates-headless.redis.svc.cluster.local"
    5) "port"
    6) "6379"
    7) "runid"
    8) "f352db09cc6a2bae2f13a9d6c397bfe47f9d1db9"
    9) "flags"
   10) "slave"
   11) "link-pending-commands"
   12) "0"
   13) "link-refcount"
   14) "1"
   15) "last-ping-sent"
   16) "0"
   17) "last-ok-ping-reply"
   18) "640"
   19) "last-ping-reply"
   20) "640"
   21) "down-after-milliseconds"
   22) "5000"
   23) "info-refresh"
   24) "6860"
   25) "role-reported"
   26) "slave"
   27) "role-reported-time"
   28) "14213"
   29) "master-link-down-time"
   30) "0"
   31) "master-link-status"
   32) "ok"
   33) "master-host"
   34) "redis-cloud-pirates-0.redis-cloud-pirates-headless.redis.svc.cluster.local"
   35) "master-port"
   36) "6379"
   37) "slave-priority"
   38) "100"
   39) "slave-repl-offset"
   40) "12411"
   41) "replica-announced"
   42) "1"
2)  1) "name"
    2) "redis-cloud-pirates-1.redis-cloud-pirates-headless.redis.svc.cluster.local:6379"
    3) "ip"
    4) "redis-cloud-pirates-1.redis-cloud-pirates-headless.redis.svc.cluster.local"
    5) "port"
    6) "6379"
    7) "runid"
    8) "aa47a57e2d5758bee67ee8bdb271cff3870e3341"
    9) "flags"
   10) "slave"
   11) "link-pending-commands"
   12) "0"
   13) "link-refcount"
   14) "1"
   15) "last-ping-sent"
   16) "0"
   17) "last-ok-ping-reply"
   18) "757"
   19) "last-ping-reply"
   20) "757"
   21) "down-after-milliseconds"
   22) "5000"
   23) "info-refresh"
   24) "78"
   25) "role-reported"
   26) "slave"
   27) "role-reported-time"
   28) "44372"
   29) "master-link-down-time"
   30) "0"
   31) "master-link-status"
   32) "ok"
   33) "master-host"
   34) "redis-cloud-pirates-0.redis-cloud-pirates-headless.redis.svc.cluster.local"
   35) "master-port"
   36) "6379"
   37) "slave-priority"
   38) "100"
   39) "slave-repl-offset"
   40) "15091"
   41) "replica-announced"
   42) "1"

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[mms-gianni]

LGTM