[rfc][icedtea-web] refactored properties loader to be reusable

[Jiri Vanek]

this refactoring is doing two things (Sorry)
 - first and msot important, is refactoring jre from properties methods to be generic properties
loader (and validator)
 - during doing so, I had realised that  system config files are heavilky os depndent, and so I
moved the methods to trait OS and implemented for linux. I'm afraid it is msut to do anyway.

J.

-- 
Jiri Vanek
Senior QE engineer, OpenJDK QE lead, Mgr.
Red Hat Czech
jvanek at redhat.com    M: +420775390109
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