Add metadata.json to keep librarian-puppet happy

Unble to install this module via librarian-puppet. Libarian-puppet
tries to build dependency list, but crashes since there is no metadata.
Seems to mostly occur with ldapdn being a transitive dependency, rather
than direct dependency.

Tested with librarian-puppet 1.3.1
Revert behaviour when not managing remote resource

Regression introduced in 24b14fbf

Building command for local-case was using a parameter :ldapi which does
not exist.
Merge pull request #10 from orionhealth/master

Add metadata.json to keep librarian-puppet happy