Fix cacerts licensing
Fix cacerts licensing

* Set as MPL-2.0
* Pull license from Mozilla, per [license commentation](https://curl.haxx.se/docs/caextract.html), as it is not included with the PEM file. This does not align with the omnibus-software definition, because the resource they point has [declared deprecation](https://github.com/bagder/ca-bundle/blob/master/README.md), and still doesn't include the license itself.

gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab