Update fluentd to v0.12.12
Update fluentd to v0.12.12

iantalarico/google-fluentd,treasure-data/omnibus-td-agent,treasure-data/omnibus-td-agent,treasure-data/omnibus-td-agent,GoogleCloudPlatform/google-fluentd,iantalarico/google-fluentd,GoogleCloudPlatform/google-fluentd,GoogleCloudPlatform/google-fluentd,iantalarico/google-fluentd