Modify output tests to pytest style and parallelise to make CI more efficient. about deepreg HOT 5 CLOSED

I'm not actually going to extend the CI timeout, I'm going to parallelise tests and convert to pytest style.

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@NMontanaBrown , I had a quick look and I think I spotted something. Both the tests that fail i.e. test_grouped_labeled_ddf.py and test_unpaired_unlabeled_ddf.py have the config paths specified as:
'/deepreg/config...'

instead of the usual (without the initial forward slash):
'deepreg/config...'

I think this was causing the config files not to be found. Don't know for sure that this is the problem but might be worth changing to check

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Fixed! Great spot @s-sd ! This means that once this is merged we can finally address your PR

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Thank you!

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I need a fresh pair of eyes... For some reason, two of the tests fail out of 6 but it's not immediately obvious why. Can someone give the latest build on Travis a once over and potentially help uncover why in particular those two tests fail (where they once... didnt?)
@zacbaum @s-sd @mathpluscode

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