Make relative_path a no-op

Setting the relative_path during package upload is a highway straight to
bad places. Users can set multiple packages to foo.rpm (or equivalent)
provide names to packages that don't match their metadata and so forth.

[noissue]

pulp_rpm/app/serializers/package.py

@@ -262,11 +262,8 @@ def deferred_validate(self, data):
             )
             + ".rpm"
         )
-        if not data.get("relative_path"):
-            data["relative_path"] = filename
-            new_pkg["location_href"] = filename
-        else:
-            new_pkg["location_href"] = data["relative_path"]
+        data["relative_path"] = filename
+        new_pkg["location_href"] = filename
 
         data.update(new_pkg)
         return data