Infra Manager: zookeper connection string

Infra Manager can not connect to zookeeper if it is installed into a node where there is no zookeeper server instance, or the local instance is down.

• This is caused by that the infra manager stack code does not set the zookeeper quorum and the CloudSolrClient falls back to localhost:2181
• Also the builder which is used for construct an org.apache.solr.client.solrj.impl.CloudSolrClient instance is deprecated: it does not handle the zookeper connection string fromat which sould be set in the stack code.

  zkhost0:port[,zkhost1:port...zkhostn:port][/solr_znode]