MySQL Connector/J multi-host helpers

[kares]

... since multi-hosts might be used for replication/loadbalancing (besides fail-over).

so that users do not have to specify the full jdbc syntax we should introduce :

adapter: mysql
  host: host1,host2
  loadbalance: true # jdbc:mysql:replication://[master host][:port],[slave host 1][:port] ...
  # replication: true # jdbc:mysql:loadbalance://[host1][:port],[host2][:port][,[host3][:port]]...

http://dev.mysql.com/doc/connector-j/en/connector-j-master-slave-replication-connection.html http://dev.mysql.com/doc/connector-j/en/connector-j-usagenotes-j2ee-concepts-managing-load-balanced-connections.html

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