Refactoring price update config. Fixing last price time.

production/mempool-config.mainnet.json

@@ -18,7 +18,8 @@
     "USE_SECOND_NODE_FOR_MINFEE": true,
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
-    "ALLOW_UNREACHABLE": true
+    "ALLOW_UNREACHABLE": true,
+    "PRICE_UPDATE_FREQUENCY": 300
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
@@ -49,9 +50,6 @@
     "ENABLED": true,
     "TX_PER_SECOND_SAMPLE_PERIOD": 150
   },
-  "PRICE_DATA_SERVER": {
-    "UPDATE_FREQUENCY": 300
-  },
   "REPLICATION": {
     "ENABLED": true,
     "AUDIT": true,