Support loading the keyring plugin when starting the server

[sydseter]

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Support loading the keyring plugin when starting the server

Data at Rest Encryption

Encryption at REST for the PCF mysql tile is current supported in the 2.5 version through the Vormetric Transparent Encryption for PCF see: https://docs.pivotal.io/p-mysql/2-5/index.html#checklist ,
but Percona, in particular, is offering specific options for solving encryption at rest that is quite interesting as they offer integration with third party providers that not only solve encyption at rest, but also offer encryption as a service solutions like the HashiCorp Vault Server.

Option for specifying system variables to the Mysql servers at startup

Specifying system variables to the Mysql servers at startup related to encryption at rest will provide production-ready solutions for solving encryption at rest. Something that would be of particular interest for data processors that are doing large scale high-risk processing of personal identifiable information. i.e healthcare- or governmental organizations.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/165413631

The labels on this github issue will be updated when the story is started.