[MRELEASE-1159] release:branch goal should support customization of commit message on working copy branch

**[Andreas Klöber](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=JIRAUSER308476)** opened **[MRELEASE-1159](https://issues.apache.org/jira/browse/MRELEASE-1159?redirect=false)** and commented

The **release:branch** goal of Maven Release Plugin should support customization of the commit message on the development resp. working copy branch which is used to bump its version (when `{}updateWorkingCopyVersions == true{`}).

Currently, only the commit message for the changes on the release branch is configurable via `{}*scmBranchCommitComment*{`}. Goal `release:prepare` supports customization of the commit message on the development branch as well via `*scmDevelopmentCommitComment*` but a similar property is missing with goal `{}release:branch{`}, effectively hard-coding it to {_}"@{prefix} prepare for next development iteration"{_}.

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**Affects:** 3.1.1

Start at the release:branch goal and compare its commit-message configuration with release:prepare. Trace the handling of scmBranchCommitComment and scmDevelopmentCommitComment, then verify that release:branch can customize the working-copy branch commit message instead of using the hard-coded default.

Written by the indexing model from the issue text.