Switch to logger (#442)

* Switch to logger

Use logger rather than io:format when logging.  The ct tests have besn switched to log to file, testutil/init_per_suite/1 may offer useful guidance on configuring logger with leveled.

As all logs are produced by the leveled_log module, the MFA metadata is uninteresting for log outputs, but can be used for explicit filter controls for leveled logs.

* iolist_to_binary not unicode_binary()

logger filters will be error and be removed if the format line is a binary().  Must be either a charlist() or a unicode_binary() - so iolist_to_binary() can't be used

* Add metadata for filter

* Update test/end_to_end/tictac_SUITE.erl

Co-authored-by: Thomas Arts <thomas.arts@quviq.com>

---------

Co-authored-by: Thomas Arts <thomas.arts@quviq.com>

test/end_to_end/iterator_SUITE.erl

@@ -1,11 +1,10 @@
 -module(iterator_SUITE).
 
--include_lib("common_test/include/ct.hrl").
--include("include/leveled.hrl").
+-include("leveled.hrl").
 
 -define(KEY_ONLY, {false, undefined}).
 
--export([all/0]).
+-export([all/0, init_per_suite/1, end_per_suite/1]).
 -export([expiring_indexes/1,
             breaking_folds/1,
             single_object_with2i/1,
@@ -26,6 +25,12 @@ all() -> [
             foldobjects_bybucket_range
             ].
 
+init_per_suite(Config) ->
+    testutil:init_per_suite([{suite, "iterator"}|Config]),
+    Config.
+
+end_per_suite(Config) ->
+    testutil:end_per_suite(Config).
 
 expiring_indexes(_Config) ->
     % Add objects to the store with index entries, where the objects (and hence