MODULES-956 Added loadfile_name parameter to apache::mod.

This will allow for more control over the module load order, since
they appear to be loaded alphabetically.
Merge pull request #737 from mhaskel/rename_mod_load

MODULES-956 Added loadfile_name parameter to apache::mod.
Renamed file resource to use loadfile_name if provided.
Merge pull request #746 from mhaskel/rename_mod_load

Renamed file resource to use loadfile_name if provided.