[classlib] [prefs] Refactor code in AbstractPreferences, FilePreferencesImpl, RegistryPreferencesImpl and some test cases.
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                 Key: HARMONY-6107
                 URL: https://issues.apache.org/jira/browse/HARMONY-6107
             Project: Harmony
          Issue Type: Test
          Components: Classlib
    Affects Versions: 5.0M8
            Reporter: Kevin Zhou
            Priority: Minor
             Fix For: 5.0M9


Refactor code in: 
(1) AbstractPreferences
(2) FilePreferencesImpl
(3) RegistryPreferencesImpl
(4) PreferencesFactoryTest
(5) PreferencesTest
Add some more test cases as well.

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