Improve application deployment/undeployment

[jgawor]

Right now applications are deployed/undeployed using the dropins directory. However, it is more preferable to deploy/undeploy the applications by updating the server.xml and adding/removing the element.

[jgawor]

For this we should take advantage of the configDropins feature in Liberty.

[MisaelSalcido]

We can create a server.xml file and deploy/undeploy apps in it so we don't mess up the user's server.xml file, but, should we put it in the configDropins/overrides/, configDropins/defaults/ or the configDropins root? Or give the user the ability to choose?

[hughesj]

Please use configDropins/overrides.