Add JUnit category interface.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595554 13f79535-47bb-0310-9956-ffa450edef68
Add maven-failsafe-plugin and additional configuration for maven-surefire-report-plugin.

  - Also factored out MaxPermSize surefire option to a new maven profile for jdk6 and jdk7 (jdk8+ removed this option due to new string implementation).

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595555 13f79535-47bb-0310-9956-ffa450edef68
Add JUnit category configuration for integration tests.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595556 13f79535-47bb-0310-9956-ffa450edef68
Add several performance tests to PerformanceTests category.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595557 13f79535-47bb-0310-9956-ffa450edef68
Add more tests to PerformanceTests category.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595558 13f79535-47bb-0310-9956-ffa450edef68