before starting to index contents, the updatesearchindexsolr.php does a ping to the solr server in order to check if it's running. This is the result of the enhancement http://issues.ez.no/17858

This works well in a mono-core setup but in a multicore setup the ping always fails because the URI used to do the PING is not a valid URL of a core.

Steps to reproduce

1. configure solr / ezfind in multicore
2. run php extension/ezfind/bin/php/updatesearchindexsolr.php --php-exec=/usr/bin/php -v -s plain_site_admin --clean-all