Installation via Service Catalog

[JohnStrunk]

Describe the feature you'd like to have.
It should be possible to deploy a Gluster cluster via a Service Catalog.

What is the value to the end user? (why is it a priority?)
Using the service catalog, we can provide a "point-and-click", menu-driven method for installing a Gluster cluster... Answer a few questions and be on your way. Not all admins are interested in editing yamls to configure their storage, and this can provide a way to guide them to a working storage system in a "wizard-like" manner.

How will we know we have a good solution? (acceptance criteria)

• A cluster admin can exclusively use the service catalog to deploy Gluster
• Admin is guided through questions necessary to deploy the cluster and provided sensible defaults where possible.
• Cluster can be destroyed in the same manner.

Additional context
I view this as just a wrapper around the yaml method. I think it would be beneficial for maintainability to keep the service catalog specific code/infra as light as possible.