Add augeas provider for openldap_database again

  Use new augeasproviders_core library
Work around broken type autoloading
Remove temporary fail in openldap::server when using augeas provider
Use augeasproviders 2 modules in spec_helper_acceptance.rb
Add acceptance test for augeas provider
Merge pull request #1 from mcanevet/dev/augeasprovider

Dev/augeasprovider
Merge pull request #22 from raphink/dev/augeasprovider

Add augeas provider for openldap_database again