fuse-karaf tests with hard coded version numbers

There's a number of tests in fuse-karaf that have hard coded version numbers, for example:

https://github.com/jboss-fuse/fuse-karaf/blob/master/modules/fuse-patch/patch-itests/src/test/java/org/jboss/fuse/patch/itests/AbstractPatchIntegrationTest.java#L82

We should be doing this in a different way so that these versions don't have to be changed at every version change.