Support mackerel plugins

[tomohiro]

Support these plugins

• mackerel-agent-plugin
• mackerel-check-plugin

Example

class { 'mackerel-agent':
  ensure              => present,
  use_metrics_plugins => true,
  use_check_plugins   => true,
  metrics_plugins     => {
    apache2     => '/usr/local/bin/mackerel-plugin-apache2',
    php-opcache => '/usr/local/bin/mackerel-plugin-php-opcache'
  },
  check_plugins       => {
    access_log => '/usr/local/bin/check-log --file /var/log/access.log --pattern FATAL',
    check_cron => '/usr/local/bin/check-procs -p crond'
  }
}