Upgrade a few Maven plugins.  Add JavaDoc plugin definition to enable excluding test code package (and subpackages) that resides in the production code area; otherwise, building prod JavaDoc failed on the test classes due to JUnit classes not found, as JUnit is a test dependency, not a prod dependency.
Upgrade a few Maven plugins.  Add JavaDoc plugin definition to enable excluding test code package (and subpackages) that resides in the production code area; otherwise, building prod JavaDoc failed on the test classes due to JUnit classes not found, as JUnit is a test dependency, not a prod dependency.

git-svn-id: 22ec8cfea0672d04b2346d96717164b900bedbad@427 d4f6eda6-38e6-11de-8fef-1f5ae417a2df

vivosys/subethasmtp