[rfc][icedtea-web] fix CodeBaseManifestEntrySignedMatching Tests by enabling Codebase check

[Lukasz Dracz]

Hello,

I have been looking into why these tests fail:

- ApplicationJNLPLocalTest
- AppletJNLPRLocalTest
- ApplicationJNLPRemoteTest
- BrowserAppletLocalTest
- BrowserJNLPHrefRemoteTest
- BrowserJNLPHrefLocalTest
- AppletJNLPRemoteTest
- BrowserAppletRemoteTest
- ApplicationJNLPLocalTestWithRemoteCodebase

I have found that the changeset 984 where manifest attributes check property was introduced to be the problem. The tests pass regularly if the check is enabled to ALL or contains CODEBASE in the combination of attributes check. 
But since when the reproducers are typically run the attributes check flag is set to NONE, I have made this patch that adds a BeforeClass and AfterClass that changes the manifest attributes check property to CODEBASE and back to its previous value after the tests. This ensures the tests pass no matter what the deployment.manifest.attributes.check is set to.

Thank you,
Lukasz Dracz
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