Add storage_capacity_mb parameter to broker

This sets the maximum amount of space to be allocated to instances by
the broker
[#71061560]
Remove max_db_per_node limit since the broker no longer uses it

[#72110750]
Added HAProxy in front of mySQL cluster

 * HAProxy has new ip address
 * Broker points to HAProxy ip
 * Added HAProxy user to mySql
 * Syslogging not correcly configured

[#71510170]
Rolling restart of mySQL nodes

[#71510170]
Uploading / syncing new blobs

[#71510170]
Bump src/cf-mysql-broker

Bump cloudfoundry/cf-mysql-broker:
  Derek Richard and Nicholas Calugar:
     Request only necessary scopes ( Travis Success: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/28267837 )
Run mysql_upgrade

* Run it everytime
* Stop MySQL and allow monit to restart if upgrade occurs or another
* error

[#72629354]