Specify surefire version in dependencyManagement.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595712 13f79535-47bb-0310-9956-ffa450edef68
Re-enable forked testing in log4j-api.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595713 13f79535-47bb-0310-9956-ffa450edef68
Specify failsafe plugin version in pluginManagement.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595714 13f79535-47bb-0310-9956-ffa450edef68