Use compiled jars to deploy applications

[bdmogal]

Currently, integration tests depend on a version of CDAP, and always get the application class from that version, and deploy it using the deploy(Class appClassz) method. However, this means that even if you are testing on a cluster with a different version of CDAP than the version that cdap-integration-tests is built with, you will still end up testing a version of the app that was cdap-integration-tests was built with.

[bdmogal]

We can achieve this with branching. So there is a workaround between releases. However, this feature would still be a nice-to-have for instances when you have to modify an app to test something out without pushing it to snapshots/local repo.