UTF8 chars broken after reconnecting to MySQL

This issue comes from IntegerNet_Solr_Model_Resource_Db::disconnectMysql which closes SQL connections during indexing.

When new queries are made after that, the connection is re-initialized but this time it will not run 
`<initStatements>` from `app/etc/local.xml` which often has to be "SET NAMES utf8".

Commenting the code for connection closing in disconnectMysql() resolves the issue.