Fix tests on CI

Three integration tests are disabled on CI:
* `OshiCollectorTest.java` is related to #366
* `Log4jSocketCollectorTest.java` is timing out (probably due to network restriction on CI to open socket)
* `SocketCollectorTest.java` is timing out (same as `Log4jSocketCollectorTest.java`, probably related to open socket on CI)
* `KafkaCollectorTest.java` has a `NoClassDefFound` error on the Kafka bundle.
* `SocketCollectorTest` (in socket collector) test is flacky with `Address already in use (Bind failed)`.
* `SocketCollectorTest` (in log4j socket collector) test is flacky with `Socket close`.
* `JmsCollectorTest` itest is flacky (`ClassNotFound javax.jms.JMSRuntimeException (no securi...`)
* `SystemCollectorTest` is related to #422

That should be investigated and renabled on CI at some point.