ISPN-4331 Add searching for TransactionManager in OSGi to GenericTransac...

...tionManagerLookup

https://issues.jboss.org/browse/ISPN-4331

You can run respective tests by mvn clean verify -Dtest=TransactionsSpanningReplicatedCachesTest in integrationtests/osgi folder.

Please let me know if you think this test is enough to verify that the Apache Aries transaction manager works correclty with ISPN. I think it could be enough (apart from stress tests that I'm not gonna run in Karaf! :))