filer store: postgres adjust default config, add optioanl schema

weed/command/scaffold.go

@@ -155,7 +155,8 @@ hostname = "localhost"
 port = 5432
 username = "postgres"
 password = ""
-database = ""              # create or use an existing database
+database = "postgres"          # create or use an existing database
+schema = "public"              # create or use an existing schema
 sslmode = "disable"
 connection_max_idle = 100
 connection_max_open = 100
@@ -175,7 +176,8 @@ hostname = "localhost"
 port = 5432
 username = "postgres"
 password = ""
-database = ""              # create or use an existing database
+database = "postgres"          # create or use an existing database
+schema = "public"              # create or use an existing schema
 sslmode = "disable"
 connection_max_idle = 100
 connection_max_open = 100