Small adjustments to changelog limiting

Sort the changelog entries by date first. I was hoping this wasn't necessary since both legacy createrepo and createrepo_c use a specific order, but I discovered that Oracle Linux used to use reverse chronological order. I have no idea what tool they used but lets play it safe for now closes #2363 #2363 (cherry picked from commit cd7fc14)
pulp · Jan 21, 2022 · c64595b · c64595b
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diff --git a/CHANGES/2363.bugfix b/CHANGES/2363.bugfix
@@ -0,0 +1 @@
+Fixed an edge case with the changelog limit.
diff --git a/pulp_rpm/app/metadata_parsing.py b/pulp_rpm/app/metadata_parsing.py
@@ -126,6 +126,9 @@ def process_other_package_element(element):
             text = subelement.text
             changelogs.append((author, date, text))
 
+    # make sure the changelogs are sorted by date
+    changelogs.sort(key=lambda t: t[1])
+
     if settings.KEEP_CHANGELOG_LIMIT is not None:
         # always keep at least one changelog, even if the limit is set to 0
         changelog_limit = settings.KEEP_CHANGELOG_LIMIT or 1