[rfc][icedtea-web] fixing CacheReproducerTest and improving VersionedJarTest

[Jiri Vanek]

hi!

fixinigVersionedjarReproducer.patch:

CacheReproducerTest had invalid import. This push is fixing it.

Also I had improved VersionedJarTest to stop randomly fail (it was test order depending)

As those are tests changes only, again, I will push tomorrow.


However. Later I noted that recently_used file is not handled via PahsAndFiles.

I moved it here, which needed some more changes - like make it properly testable and so get rid of 
this untestable ENUM and replace it by getter singleton with possibility to make testable instance.

I agree that this patch was written in rush, and needs  proper review.
J.
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