Adding acceptance test for second plan quota

[#67082390]
Increasing timeout when inserting bulk data

* Our second plan inserts 1GB - current timeout was too low

[#67082390]
Bump src/cf-mysql-broker

Bump cloudfoundry/cf-mysql-broker:
  Alex Stupakov and Nicholas Calugar:
     Remove class dependencies from migration ( Travis Success: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/27893049 )
Allow spiff merge of max_storage_mb for plans in catalog