Provide for configuring default properties

[corneil]

Problem description:
There is often a need for common properties when deploying streams or tasks. Configuring and redeploying skipper of dataflow shouldn't be required to provide default properties.

Solution description:
Provide for saving default properties per platform and launch type.
The properties will be added if they don't exist in the incoming property set when launching a task or stream.
Dataflow should provide an endpoint for creating, modifying and deleting properties.
An entry will have indicators that show it applies to tasks or streams or all.
All may indicator future application type launched.

A simple example of this the configuration for common metrics