Extra debug logging, references #6

(cherry picked from commit bbae8c9)

Author: michaelklishin

src/rabbit_peer_discovery_aws.erl

@@ -82,6 +82,8 @@
 list_nodes() ->
     M = ?CONFIG_MODULE:config_map(?BACKEND_CONFIG_KEY),
     {ok, _} = application:ensure_all_started(rabbitmq_aws),
+    rabbit_log:debug("Started rabbitmq_aws"),
+    rabbit_log:debug("Will use AWS access key of '~s'", [get_config_key(aws_access_key, M)]),
     ok = maybe_set_region(get_config_key(aws_ec2_region, M)),
     ok = maybe_set_credentials(get_config_key(aws_access_key, M),
                                get_config_key(aws_secret_key, M)),
@@ -140,6 +142,7 @@ get_config_key(Key, Map) ->
 maybe_set_credentials("undefined", _) -> ok;
 maybe_set_credentials(_, "undefined") -> ok;
 maybe_set_credentials(AccessKey, SecretKey) ->
+    rabbit_log:debug("Setting AWS credentials, access key: '~s'", [AccessKey]),
     rabbitmq_aws:set_credentials(AccessKey, SecretKey).