(FACT-607) Include facter man pages in the package for OSX.

Without this commit, the facter man page is not included in the package for OSX.

This commit adds the appropriate directives to ext/osx/file_mapping.yaml
to include facter man pages in the package for OSX. This commit should resolve the merge conflict caused by trying to merge the branch `facter-2` into the branch `master`.

Resolves conflicts:
	ext/osx/file_mapping.yaml
I think Adrien is correct, we don't want to re-add 'private/etc' here. Commit f67d908959339b4825803dfdb17c2ba996fe1b3d targeted facter-2. I'm wondering if the commits to remove /private/etc from file_mappings.yaml and remove the unused /private/etc/facter.conf (17f5e2aee11ba68daa5c63556c041a452df79569 and d091bf882d731232ebcbf8d1dc324593cc837a98) didn't make it into facter-2?