all: sync with composer changes

Upstream composer has introduce a few changes that we need to
adapt for:

 - the koji composer API is now exposed on the standard https
   port (443). Thus koji hub and web need to move to a different
   pair: 8080 (http) and 4343 (https). Change the scripts and
   tests for that

 - the koji API gained a prefix 'api/composer-koji/v1/'. Change
   client and unit tests to use that prefix. Use urljoin to
   create new APIs

 - composer configuration format (osbuild-composer.toml) has
   changed and now also includes configuration for the CA
   and allowed domains

 - update the composer RPM repositories to the commit for the
   21 upstream release.

test/unit/test_builder.py

@@ -7,6 +7,7 @@ import json
 import os
 import sys
 import tempfile
+import urllib.parse
 import uuid
 import unittest.mock
 from flexmock import flexmock
@@ -17,9 +18,12 @@ import httpretty
 from plugintest import PluginTest
 
 
+API_BASE = "api/composer-koji/v1/"
+
+
 class MockComposer:
     def __init__(self, url, *, architectures=["x86_64"]):
-        self.url = url
+        self.url = urllib.parse.urljoin(url, API_BASE)
         self.architectures = architectures[:]
         self.composes = {}
         self.errors = []
@@ -29,7 +33,7 @@ class MockComposer:
     def httpretty_regsiter(self):
         httpretty.register_uri(
             httpretty.POST,
-            self.url + "compose",
+            urllib.parse.urljoin(self.url, "compose"),
             body=self.compose_create
         )
 
@@ -68,7 +72,7 @@ class MockComposer:
 
         httpretty.register_uri(
             httpretty.GET,
-            self.url + "compose/" + compose_id,
+            urllib.parse.urljoin(self.url, "compose/" + compose_id),
             body=self.compose_status
         )