Fork of mysqlnd_ms php extension with new functionalities and porting to PHP 7.*

There is now a fork for the mysqlnd replication and load balancing plugin, available at [URL]https://github.com/sergiotabanelli/mymysqlnd_ms[/URL]: * PHP7.x porting * New QOS session consinstency and transaction id injection * Server side read consistency (mysql >= 5.7.6 with --session-track-gtids=OWN_GTID) * Mysql native built-in read consistency * PHP session_id read consistency enforcing * Server side write consistency (mysql >= 5.7.6 with --session-track-gtids=OWN_GTID) * Multi master write consistency * Multi master write consistency logical partitions * Client side read consistency * Distinct master connection for client side read consistency and gtid injection * Client side transaction id injection with memcached mysql plugin * Simple client side write consistency * Multi master write consistency * Multi master write consistency logical partitions * New config_dir ini directive for connection based json config files * New master_on ini directive for rw splitting * New mysqlnd_ms_set_trx and mysqlnd_ms_unset_trx php functions for application based transaction tracking