[MASSEMBLY-597] Update to p-archiver 2.8.4

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639465 13f79535-47bb-0310-9956-ffa450edef68
updated parent pom and fixed errors reported by Checkstyle

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639470 13f79535-47bb-0310-9956-ffa450edef68
- Release preparation for version 27.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639492 13f79535-47bb-0310-9956-ffa450edef68
- Release preparation for version 27.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639496 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release maven-plugins-27

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639497 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639499 13f79535-47bb-0310-9956-ffa450edef68
[MASSEMBLY-597] Update to p-archiver 2.8.4

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1639502 13f79535-47bb-0310-9956-ffa450edef68