[MRELEASE-1125] Add a waitAfterTagging config parameter

**[Roberto Lo Giacco](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rlogiacco)** opened **[MRELEASE-1125](https://issues.apache.org/jira/browse/MRELEASE-1125?redirect=false)** and commented

Our Jenkins pipeline gets activated upon pushing to the GIT repository and checks if the current commit has a release tag to decide if the build must produce an artifact.

Sometimes the commit to prepare for the next release gets pushed before the pipeline gets a chance to start, thus skipping the release process and forcing a rollback and restart.

With the introduction of a **waitAfterTagging** configuration property we can provide a 3-5sec delay to ensure the pipeline gets activated before the next commit gets pushed in.

If desireable I can provide a pull request for this: I really need it.

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No further details from [MRELEASE-1125](https://issues.apache.org/jira/browse/MRELEASE-1125?redirect=false)