add a base provider class
add a base provider class

This class has all the logic to fetch data from the Nexus3 API,
merge it with the puppet configuration and update the server.
The providers extended from it and the types only have to declare
their properties and the scripts for read, create, update or delete
data when applicable.

wandenberg/puppet-module-nexus3_rest,wandenberg/puppet-module-nexus3_rest,wandenberg/puppet-module-nexus3_rest