ACCUMULO-2171 Change release to skip most tests

  Tests should have been performed before a release, and can be tested
  again during voting, prior to approval.
ACCUMULO-2171 Explicitly specify phase for latex plugin

  Work around an issue (https://jira.codehaus.org/browse/MNG-5478) where
  plugins execute out of order during release by explicitly setting the
  execution phase of the latex-maven-plugin to later in the build.
ACCUMULO-2652 Fix build warning on older maven versions