(#14299) Resolve Modulefile name mismatch.

The modulefile name is puppet-apt, but the module is released to forge
under puppetlabs. This causes a dependency confusion for puppet module
tool, which has been fixed by this patch.

Previous:

    $ puppet module list
    ~/.puppet/modules
    ├── puppet-apt (v0.0.2)
    ├── puppetlabs-mongrodb (v0.0.1)
    └── puppetlabs-stdlib (v2.3.1)

Now:

    $ puppet module list
    ~/.puppet/modules
    ├── puppetlabs-apt (v0.0.2)
    ├── puppetlabs-mongrodb (v0.0.1)
    └── puppetlabs-stdlib (v2.3.1)