No more than 1 job should be placed in the dispatch queue at a time
Issues: NARC-11

The number of HarvestJobs queue for processing should be minimized at a given time for the following reasons:

When the HarvestJobManager is restarted, all queue jobs are resubmitted which will cause dublicate processing of the HarvestJobs
Modifing HarvestDefinitions will not have an effect on queue jobs.

Test specification

Create 4 selektive harvest jobs

Create selective harvest	Domain	bs.dk
Create selective harvest	Domain	dbc.dk
Create selective harvest	Domain	netarkivet.dk
Create selective harvest	Domain	kb.dk

Activate all harvests

Because only 2 selective harvesters (high-priority) are available, only 2 of the jobs should be started initially (one pr. HIGH_PRIORITY harvester). The remaining two jobs should remain in state 'New' until a harvest finishs and the next job is started.

Verify jobs are created	JobIDs	1,2,3,4
Verify jobs started	Number of jobs	2
Verify jobs new	Number of jobs	2

Wait for the first job is done (with 5 minutes timeout)

Wait for next done job	Timeout	300
Verify jobs started	Number	2
Verify jobs new	Number	1
Verify Jobs done	Number	1

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