EventBusTimeoutsTest randomly failing, and test time factor

[galderz]

https://vertx.ci.cloudbees.com/job/vert.x-mod-lang-scala/1439/testReport/junit/org.vertx.scala.tests.core.eventbus/EventBusTimeoutsTest/replyWithinTimeout/

java.lang.AssertionError: Should receive message within time, but got exception: org.vertx.java.core.eventbus.ReplyException: Timed out waiting for reply
    at org.junit.Assert.fail(Assert.java:88)
    at org.vertx.testtools.VertxAssert.fail(VertxAssert.java:126)
    at org.vertx.scala.tests.core.eventbus.EventBusTimeoutsTest$$anonfun$replyWithinTimeout$3.apply(EventBusTimeoutsTest.scala:30)
    at org.vertx.scala.tests.core.eventbus.EventBusTimeoutsTest$$anonfun$replyWithinTimeout$3.apply(EventBusTimeoutsTest.scala:25)

@Narigo Maybe the timeouts should be larger to accomodate slower scenarios?

We could also create a vertx.scala.test.timefactor system or configuration property for tests and use that to multiply any timeouts we provide at test time? Then, when running in CI, we'd give it a 10 or 20 factor, and when running in our machines, give it 1. WDYT?