Simplified example JBatch exec project

[OndroMih]

This is to simplify the example exec project for JBatch and creation of exec projects for other implementations:

• moved the default tck properties so that they end up in the JAR artifact and can be accessed from there by the exec project
• the exec project now reads the default tck properties and adds its own properties. I renamed the properties file so that there's no need to have the overhead of using an ant script to copy it to git-ignored test.properties. I moved it to the config directory so that it's separated from the files created when running the TCK (like Derby log and DB).

As before, the TCK can be run against JBatch simply with mvn verify.

[scottkurz]

Thanks Ondro. The main reason we still have the Ant execution is SigTest. Responding on our dev ML.

[scottkurz]

Thx Ondro. Just getting to this. I made some comments and suggested the changes in my PR OndroMih#5 which I made as a PR to your PR branch.

Please take a look. Thanks.

[scottkurz]

Closing this PR.

I added Ondro's core change where we just define a properties file to configure both jbatch + the TCK runtime tests in the newly named: com.ibm.jbatch.tck.exec/config/tck.exec.properties and committed directly to master with:
fa3310b

I removed the sigtest stuff, which we'll have to do later.

Note there are some other TODOs like:

• update the TCK reference guide now that we have removed batch-tck-testng.properties
• document the sleep/wait time properties available in the runtime tests (either explicitly, 1-by-1, or just show how to find them if you need to )
  but we'll have to address them later.