Apache Aries TM[1] runs in OSGi already[2], so let's validate that our test suite works fine with it.
Would be nice to have a maven profile that allows running transactions with this manager on demand.

[1]http://search.maven.org/#artifactdetails%7Corg.apache.aries.transaction%7Corg.apache.aries.transaction.manager%7C1.1.0%7Cbundle
[2] https://access.redhat.com/site/documentation/en-US/Red_Hat_JBoss_Fuse/6.0/html/EIP_Transaction_Guide/files/XaTM-Access.html