Add sets_creation so we can disable this class on Arbitrator servers when auth is enabled

[JvGinkel]

…while auth is enabled

Pull Request (PR) description

On arbitrator servers you get the following message when auth is enabled:

Notice: /Stage[main]/Mongodb::Replset/Mongodb_replset[example_set]/ensure: created (corrective)
Warning: Host mongoarb01:27017 is available, but you are unauthorized because of authentication is enabled: true

In debug mode you can see:

Debug: Request failed: 'Execution of '/usr/bin/mongo admin --quiet --host 127.0.0.1:27017 --eval load('/root/.mongorc.js'); printjson(rs.conf())' returned 252: uncaught exception: Error: Could not retrieve replica set config: {

      "ok" : 0,

      "errmsg" : "not authorized on admin to execute command { replSetGetConfig: 1.0, lsid: { id: UUID(\"a2213cd2-e6c4-4d15-bf29-d01b7a54a838\") }, $db: \"admin\" }",

      "code" : 13,

      "codeName" : "Unauthorized"

} :

The admin user has all the needed rights but this errmsg keeps telling us it has not.

For this reason I created a variable so we can disable this class on our arbitrator nodes by setting:
mongodb::replset::sets_creation: false

This Pull Request (PR) fixes the following issues

[JvGinkel]

Anything needed be done to get this merged? We are running now in a fork and would like to switch back to this public version of the module.