[MPOM-57] Configure waitBeforeTagging for maven-release-plugin

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1624775 13f79535-47bb-0310-9956-ffa450edef68
[MPOM-55] Update release and scm plugins to support newer versions of git

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1624777 13f79535-47bb-0310-9956-ffa450edef68