update env-devel

Author: giancarloromeo

.env-devel

@@ -59,7 +59,7 @@ CLUSTERS_KEEPER_EC2_INSTANCES_PREFIX=""
 CLUSTERS_KEEPER_LOGLEVEL=INFO
 CLUSTERS_KEEPER_MAX_MISSED_HEARTBEATS_BEFORE_CLUSTER_TERMINATION=5
 CLUSTERS_KEEPER_PRIMARY_EC2_INSTANCES=null
-CLUSTERS_KEEPER_TASK_INTERVAL=30
+CLUSTERS_KEEPER_TASK_INTERVAL=00:00:30
 CLUSTERS_KEEPER_WORKERS_EC2_INSTANCES=null
 CLUSTERS_KEEPER_TRACING={}