[MRELEASE-904] scm unedit is never called when useEditMode = true

**[Chris Graham](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=chrisgwarp)** opened **[MRELEASE-904](https://issues.apache.org/jira/browse/MRELEASE-904?redirect=false)** and commented

When useEditMode = true is set, all files that need to be locked (via scm->edit) are locked. However, scm->unedit is never called to release the locks.

ref: https://jira.codehaus.org/browse/SCM-725

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**Affects:** 2.5.1

**Issue Links:**
- [SCM-725](https://issues.apache.org/jira/browse/SCM-725) Failure to unlock pom.xml on RTC server after release:perform
(_**"is depended upon by"**_)

Start by tracing the release:perform flow when useEditMode = true, focusing on where scm->edit locks files and where scm->unedit should release them. Reproduce the lock behavior and verify that the release flow invokes unedit and leaves no files locked.

Written by the indexing model from the issue text.