Add separator field to database_config.json (sonic-net#3581)

Author: dzhangalibaba

dockers/docker-database/database_config.json

@@ -9,38 +9,47 @@
     "DATABASES" : {
         "APPL_DB" : {
             "id" : 0,
+            "separator": ":",
             "instance" : "redis"
         },
         "ASIC_DB" : {
             "id" : 1,
+            "separator": ":",
             "instance" : "redis"
         },
         "COUNTERS_DB" : {
             "id" : 2,
+            "separator": ":",
             "instance" : "redis"
         },
         "LOGLEVEL_DB" : {
             "id" : 3,
+            "separator": ":",
             "instance" : "redis"
         },
         "CONFIG_DB" : {
             "id" : 4,
+            "separator": "|",
             "instance" : "redis"
         },
         "PFC_WD_DB" : {
             "id" : 5,
+            "separator": ":",
             "instance" : "redis"
         },
         "FLEX_COUNTER_DB" : {
             "id" : 5,
+            "separator": ":",
             "instance" : "redis"
         },
         "STATE_DB" : {
             "id" : 6,
+            "separator": "|",
             "instance" : "redis"
         },
         "SNMP_OVERLAY_DB" : {
             "id" : 7,
+            "separator": "|",
             "instance" : "redis"
         }
     },