[Demo] Copy scenario assembly to demo assembly

Use scenario assembly as starting point for
demo assembly, which serves to provide
nasa/MCT-Plugins#154.
[Demo] Remove configuration for MySQL db

Demo build will use Derby for database;
MySQL db is not needed.
[Demo] Remove MySQL properties from dist

Remove MySQL properties from assembly description.
[Demo] Remove custom mct.properties

Remove custom mct.properties; simply use
mct.properties as provided by platform build.
[Demo] Include satellites and relevant view in build
[Demo] Change demo artifact name
Merge pull request #155 from VWoeltjen/mctPlugins154

[Demo] Add demo build