remove old unused install.pp
[#51888499] Moved elasticsearch::package to elasticsearch::install

This is done for the following reasons
* Also the package module was having much more stuff than just package
  installation so fits better as install module
* Install in its definition covers all scenarios of package and other
  types of installations. Using the conventions provided by
  puppet-module-skeleton we should use install
Merge pull request #3 from alphagov/move_package_to_install

Move package to install