fix CHEF-1009 by not trying to reindex WebUIUsers and openid_regs
fix CHEF-1009 by not trying to reindex WebUIUsers and openid_regs

These are actually not indexed in the first place, so the de facto
behavior is unchanged.

In the long term, these should be made indexable or we should not try to
index them ever (they are sent to the indexer but then dropped)

chef/chef-solr