Provide credentials when auth is enabled

Author: stevenpost

lib/puppet/provider/mongodb.rb

@@ -97,6 +97,11 @@ def self.mongosh_cmd(db, host, cmd)
       args.push('--tlsAllowInvalidHostnames') if tls_invalid_hostnames(config)
     end
 
+    if auth_enabled(config)
+      args += ['--username', 'admin']
+      args += ['--password', 'password']
+    end
+
     args += ['--eval', cmd]
     mongosh(args)
   end