CDB-3094 Discovered that EXECUTE FORMAT seems to quote schema names when it needs to

scripts-available/CDB_CartodbfyTable.sql

@@ -47,7 +47,7 @@ BEGIN
   -- TODO: Check that user quota is set ?
   BEGIN
   -- Content will be discarded
-    EXECUTE FORMAT('SELECT "%I"._CDB_UserQuotaInBytes();', schema_name::text) INTO sql;
+    EXECUTE FORMAT('SELECT %I._CDB_UserQuotaInBytes();', schema_name::text) INTO sql;
   EXCEPTION WHEN undefined_function THEN
     RAISE EXCEPTION 'Please set user quota before cartodbfying tables.';
   END;

scripts-available/CDB_Quota.sql

@@ -51,7 +51,7 @@ BEGIN
     qmax := TG_ARGV[1];
   ELSE
     BEGIN
-      EXECUTE FORMAT('SELECT "%I"._CDB_UserQuotaInBytes();', schema_name) INTO qmax;
+      EXECUTE FORMAT('SELECT %I._CDB_UserQuotaInBytes();', schema_name) INTO qmax;
       EXCEPTION WHEN undefined_function THEN
       RAISE EXCEPTION 'Missing "%"._CDB_UserQuotaInBytes()', schema_name;
     END;
@@ -93,7 +93,7 @@ BEGIN
   END IF;
 
   BEGIN
-    EXECUTE FORMAT('SELECT "%I"._CDB_UserQuotaInBytes();', schema_name::text) INTO current_quota;
+    EXECUTE FORMAT('SELECT %I._CDB_UserQuotaInBytes();', schema_name::text) INTO current_quota;
   EXCEPTION WHEN undefined_function THEN
     current_quota := 0;
   END;