Added 2 mariadb nodes to make 3 node galera cluster

[#71062154]
Change mysql.user plugin to '' for all users not just root

[#71062154]
Increase timeout for mariadb start

[#71062154]
Added second plan 1gb to MySQL broker

- creates management database for mapping service instances to plans
- mgmt db is populated with the existing service instances using the
  first plan in the catalog
- migration is executed only on the first broker node
- extended the acceptance tests to run create/bind/unbind/delete for
  instances of all plans
- renamed mgmt db from test to mysql_broker

[#66627936]
Extend canary_watch_time and update_watch_time

* New MariaDB nodes take considerable time to start.

[#71062154]
Bump src/cf-mysql-broker

Bump cloudfoundry/cf-mysql-broker:
  Hristo Iliev and Leo Rossignac-Milon:
     Create and load the broker schema on Travis ( Travis Success: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/26991508 )
     Disable migration checks for mysql broker specs ( Travis finished: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/26991251 )
     Added second plan 1gb to MySQL broker ( Travis Failed: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/26985100 )
Remove extra start command, log start/stop output to ctl log
Bump src/cf-mysql-broker

Bump cloudfoundry/cf-mysql-broker:
  Nicholas Calugar and Will Pragnell:
     Protecting against SQL Injection ( Travis Success: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/27157296 )
Update cf-test-helpers
Update ginkgo
Add ginkgo.trace flag to bin/test