elastalert-test-rule should respect ES config
elastalert-test-rule should respect ES config

Use ElastAlert's configuration builder to respect the ES options
specified in the individual rules file, and use ElastAlert's
factory to construct the client used to connect to ES.

megancarney/elastalert,jetyang2005/elastalert,jetyang2005/elastalert,mash0304/elastalert,iamrudra/elastalert,lytics/elastalert,ltagliamonte/elastalert,rounds/elastalert,jetyang2005/elastalert,saltukalakus/elastalert,AlphaStaxLLC/elastalert,amoennin/elastalert,dvopsway/elastalert,Yelp/elastalert,gbenoit79/elastalert,saltukalakus/elastalert,kkoppel/elastalert,brianparry/elastalert,rprabhat/elastalert