fix "caddy-frontend: Run kedifa-updater with prepare"

Buildout's kedifa updater just prepares, and so real one has to be run.

software/caddy-frontend/test/test.py

@@ -5521,6 +5521,7 @@ class TestSlaveSlapOSMasterCertificateCompatibilityUpdate(
 
     })
     self.runComputerPartition(max_quantity=1)
+    self.runKedifaUpdater()
 
     result = self.fakeHTTPSResult(
       parameter_dict['domain'], parameter_dict['public-ipv4'], 'test-path')