api: allow to prefix packages with a +

When adding a + to the beginning of a package name it will modify the
order of packages and thereby fix dependency issues of OPKG.

This is more of a advanced user feature.

Signed-off-by: Paul Spooren <mail@aparcar.org>

asu/api.py

@@ -84,7 +84,7 @@ def validate_packages(req):
         else:
             tr.add(p)
 
-    req["packages"] = tr
+    req["packages"] = list(map(lambda x: x.removeprefix("+"), sorted(tr)))
 
     # store request packages temporary in Redis and create a diff
     temp = str(uuid4())