test: add a test file dedicated to an important distributed case
This test file introduces documented test case for obsolescence markers usage
that are important to distributed workflow cases.
In the distributed case, new changesets, markers, and phases can be added in
orders that would not happen during the local only usage. Documenting these
scenarios and test them is important as we make progress with various
obsolescence aspects.
<tr>
<td class="age">{date|rfc822date}</td>
<td class="author">{author|person}</td>
<td class="description">
<a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a>
{inbranch%changelogbranchname}{branches%changelogbranchhead}{tags%changelogtag}{bookmarks%changelogtag}
</td>
</tr>