[#16] dev-env: Enable metrics for services.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

services/http_gate/cfg/config.yml

@@ -1,6 +1,10 @@
 logger:
   level: debug
 
+prometheus:
+  enabled: true
+  address: :9090
+  
 rebalance_timer: 5m  # Interval to check nodes health
 
 connect_timeout: 60s  # Timeout to dial node

services/rest_gate/cfg/config.yml

@@ -1,3 +1,7 @@
+prometheus:
+  enabled: true
+  address: :9090
+
 server:
   # The IP and port to listen on.
   listen-address: 0.0.0.0:8090

services/s3_gate/cfg/config.yml

@@ -1,6 +1,10 @@
 logger:
   level: debug
 
+prometheus:
+  enabled: true
+  address: :9090
+
 # Interval to check node health
 rebalance_interval: 30s