[rfc][icedtea-web] Allow cache directory to be changed during runtime

[Jie Kang]

Hello,

This patch consolidates the cacheDir instance to a single place and allows us to change it during run-time. It also modifies a unit test to use this new feature. This feature is aimed mainly at unit tests that need the cache, but do not want to modify the icedtea-web's user cache.

Thoughts? Okay to push?


Regards,

-- 

Jie Kang
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