Tests: only run for the current soapui version

As we did for all tests when implementing #66, stop performing tests on
several soapui version. We only care about the current one.
So rename tests to remove references to any versions and remove hard coded
versions (use property instead)
Rename test that run mock-as-war goal with oss

Currently, only OSS mock as war generation is supported
Only execute tests with maven 3.0.x

Other versions are not supported because of the use of sonatype aether
(see #70)