Add debug statement

Author: stevenpost

lib/puppet/provider/mongodb_replset/mongo.rb

@@ -176,8 +176,9 @@ def get_hosts_status(members)
         Puppet.debug "Host #{host} is alive but unconfigured: #{status['info']}"
         alive.push(member)
       end
-    rescue Puppet::ExecutionFailure
+    rescue Puppet::ExecutionFailure => e
       Puppet.warning "Can't connect to replicaset member #{host}."
+      Puppet.warning(e)
     end
     alive.uniq!
     dead = members - alive