Update test from JUnit 4.11 to 4.12 with Powermock from 1.4.12 to 1.6.5, all running on Java 6.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/email/trunk@1744531 13f79535-47bb-0310-9956-ffa450edef68
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