kas: Eliminate Context.keep_config flag

This variable was only set in the shell plugin to disable the normal
behaviour of the FinishSetupRepos step. We can achieve the same result
by not adding the FinishSetupRepos step when we wish to keep the config
in the build environment unchanged.

Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas/plugins/shell.py

@@ -91,15 +91,14 @@ class Shell:
         if 'SSH_PRIVATE_KEY' in os.environ:
             macro.add(SetupSSHAgent())
 
-        ctx.keep_config = args.keep_config_unchanged
-
         macro.add(InitSetupRepos())
 
         repo_loop = Loop('repo_setup_loop')
         repo_loop.add(SetupReposStep())
 
         macro.add(repo_loop)
-        macro.add(FinishSetupRepos())
+        if not args.keep_config_unchanged:
+            macro.add(FinishSetupRepos())
 
         macro.add(SetupEnviron())
         macro.add(SetupHome())