drop duplicate rubocop task
drop duplicate rubocop task

@DavidS copied the task into puppetlabs_spec_helper:
https://github.com/puppetlabs/puppetlabs_spec_helper/blob/6c8aa5b921f96e860b0f5f92dde13647572122ff/lib/puppetlabs_spec_helper/rake_tasks.rb#L558-L569

voxpupuli/modulesync_config,puppet-community/modulesync_config,dhoppe/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,dhoppe/modulesync_config,dhoppe/modulesync_config,voxpupuli/modulesync_config,dhoppe/modulesync_config