Retain the commit id of the app server being used for testing

When we rebase jboss-as we should log the commit of the rebased master branch.

If you just add the command:
echo This is the JBoss-AS commit
git rev-parse upstream/master

That will be enough as the build log will have:
This is the JBoss-AS commit
d56a7873e277017e56fcbfc74f814e0d2703f503

For example.

This is important when we have problems introduced in the AS so we can help to identify when the problem is first observed more defined way than a timestamp (which is timezoned against a failure in Newcastle and a GitHub timestamp (whenever they are)).