LPS-43394 solr preemptive auth

Hey Mike,

I got a PR from Hugo: https://github.com/driesco/liferay-plugins/pull/4 regarding SOLR preemptive auth. I found this link useful: http://stackoverflow.com/questions/2014700/preemptive-basic-authentication-with-apache-httpclient-4

Please review when you have a chance and send to bchan.

Thanks!
Daniela