JT400 tests can not be run in parallel #6018

[JiriOndrusek]

fixes #6018

Better locking mechanism is iused.

1 file for locking has to be provided in the integrated file system. Each execution then asks for the lock of that file using JTOpen API.
Instruction of how to create such file are added into the readme.adoc.

Investigation of parallel executions revealed, that there might be a problem in jt400 regarding release of the connections.
Even if the route

from("jt400://username:password@localhost/qsys.lib/qusrsys.lib/myq.msgq?sendingReply=true")
.choice()
    .when(header(Jt400Constants.MESSAGE_TYPE).isEqualTo(AS400Message.INQUIRY))
        .process((exchange) -> {
            String reply = // insert reply logic here
            exchange.getIn().setBody(reply);
        })
        .to("jt400://username:password@localhost/qsys.lib/qusrsys.lib/myq.msgq");

is stopped, access to the queue is still blocked (about 20-30 seconds) and throws CPF2451 Message queue REPLYMSGQ is allocated to another job.

Therefore I'm adding a clear of the queues to the @BeforeAll method with await to wait for the lock to go away.
(Until a proper fix is implemented)