Remove useless sleep() in JobQueueTest

Remove useless sleep() in JobQueueTest

I noticed JobQueueTest::testRootDeduplication takes ~ 6.5 seconds, which
is due to the test method using sleep(1) and being passed the provider
provider_queueLists which yields six items.

The reason is to have the array returned by Job::newRootJobParams() to
have an incread value for 'rootJobTimestamp'.  Instead, just copy the
previous array of parameters and increment the UNIX timestamp and
converting back to TS_MW format.

Change-Id: I75066df73f9f92e56b89eb6d928c41e949a2d6a9