Java client issues fixes backport (#2419)

* added 'remove_binary' to AttachmentProcessor (issue #727)

* making node info path optional (issue #242)

* making node info discover seed_host optional (issue #242)

* changed description for update by query  (issue #315)

* initial_master_nodes from string to string[] (issue #242)

* correct node info discover class (issue #242)

* generate and contrib