Allow custom settings configs for maven projects

Allow custom settings & global-settings config files to be configured
for maven projects.

In addition, the previously defined empty nodes for these configurations
were misnamed and this corrects that as well.

This change also switches to using an included test as an example.

Change-Id: I9f832f498e358268b3896ead3a78462e408bdd9d
Signed-off-by: Andrew Grimberg <grimbeaj@gmail.com>
Merge "Allow custom settings configs for maven projects"