fluent does not resend USR1 to children

[dmnfortytwo]

..so log rotation becomes more complex

2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-elasticsearch' version '2.4.0'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-flowcounter' version '1.3.0'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-kafka' version '0.6.5'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-multiprocess' version '0.2.2'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-prometheus' version '1.0.1'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-rewrite-tag-filter' version '2.0.1'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-s3' version '1.1.0'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-td' version '1.0.0'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-td-monitoring' version '0.2.3'
2018-04-17 15:34:17 +0000 [info]: gem 'fluent-plugin-webhdfs' version '1.2.2'
2018-04-17 15:34:17 +0000 [info]: gem 'fluentd' version '1.0.2'