Remove duplicate metadata_lint check
Remove duplicate metadata_lint check

Since puppetlabs_spec_helper 1.1.0 this has been part of the validate
task. Validate is part of release_checks.

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