split out options from read_config()

There is no longer any reason for these to be intertwined.

This deliberately avoids touching some files as much as possible because
they are super tangled and due to be replaced.  Those files are:

* fdroidserver/build.py
* fdroidserver/update.py

# Conflicts:
#	tests/testcommon.py

# Conflicts:
#	fdroidserver/btlog.py
#	fdroidserver/import_subcommand.py

tests/update.TestCase

@@ -60,7 +60,7 @@ import fdroidserver.metadata
 import fdroidserver.update
 from fdroidserver.common import CATEGORIES_CONFIG_NAME
 from fdroidserver.looseversion import LooseVersion
-from testcommon import TmpCwd, mkdtemp
+from testcommon import TmpCwd, mkdtemp, parse_args_for_test
 
 
 DONATION_FIELDS = ('Donate', 'Liberapay', 'OpenCollective')
@@ -1207,7 +1207,7 @@ class UpdateTest(unittest.TestCase):
 
         # Set up options
         fdroidserver.common.options = Options
-        config = fdroidserver.common.read_config(fdroidserver.common.options)
+        config = fdroidserver.common.read_config()
         if 'apksigner' not in config:  # TODO remove me for buildserver-bullseye
             self.skipTest('SKIPPING test_update_with_AllowedAPKSigningKeys, apksigner not installed!')
         config['repo_keyalias'] = 'sova'
@@ -2280,7 +2280,7 @@ if __name__ == "__main__":
         default=False,
         help="Spew out even more information than normal",
     )
-    fdroidserver.common.options = parser.parse_args(['--verbose'])
+    parse_args_for_test(parser, sys.argv)
 
     newSuite = unittest.TestSuite()
     newSuite.addTest(unittest.makeSuite(UpdateTest))