Support for filters (Maven variables) & WAR overlays - PART 2: WAR-in-EAR modules

[scottkurz]

This issue continues the work described in epic #1104.

In that epic, we socialized and received approval for a design for handling resource filtering and WAR overlays, as well as for applying filtering to server config (server.xml, etc.).

At this point, we're refactoring the issue descriptions to carve out and separate the piece that we implemented vs. the pieces that we did not.

This issue will be used to track a key piece remaining: the addition of the web resources filtering to WAR modules within EAR modules.

Note the UFO design is at: https://ibm.box.com/s/k6zinwfzvwfzfp0fl4mv7fv9mbmuubfa

The part related to EAR modules is described in slides 23-27

Note we only set out to add filtering to WAR-level resources in EAR modules, and notably did NOT include filtering of the EAR-level application.xml in the design.