Remove race conditions from tests

[lechner]

Testing the qmqp protocol fails because the testing server cannot acquire the lock. This is solved by sleeping for one second so the previous server has time to exit and clear the lock. Also, sleep elsewhere before removing temporary directories.

[bruceg]

I'm not sure I like sleeping to make sure a job exited (it's unavoidable when starting because services don't notify when they've started). Does adding a wait instead of sleep 1 resolve the issue for you?

[lechner]

Yes, wait works great. Will you please add them, or should I prepare a new pull request? Thank you!

[bruceg]

I've added wait instead of sleep myself now.

[lechner]

Thank you!