mocha: Allow 2.x

[bastelfreak]

Summary

Provide a detailed description of all the changes present in this pull request.

Additional Context

Add any additional context about the problem here.

• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

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Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified.

[ekohl]

There was talk of removing mocha support altogether. Perhaps it's time to move forward with that?

[bastelfreak]

Vox Pupuli still has some modules that use mocha:

$ grep mocha ~/code/modulesync_config/modules/voxpupuli/puppet-*/.sync.yml
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-cassandra/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-corosync/.sync.yml:  mock_with: ":mocha"
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-cvmfs/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-erlang/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-filemapper/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-firewalld/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-firewalld/.sync.yml:      - gem: 'mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-nodejs/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-rabbitmq/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-redis/.sync.yml:  mock_with: ":mocha"
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-selinux/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-swap_file/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-windowsfeature/.sync.yml:  mock_with: ':mocha'
/home/bastelfreak/code/modulesync_config/modules/voxpupuli/puppet-zabbix/.sync.yml:  mock_with: ':mocha'

[jordanbreen28]

@bastelfreak thanks for this!