git: rename "git_operation_disabled" to "operations_disabled"

Prepare for other version control systems and remove "git" from the
names.

Signed-off-by: Henning Schild <henning.schild@siemens.com>

kas/config.py

@@ -211,7 +211,7 @@ class Config:
                 rep = Repo(url=url,
                            path=path,
                            layers=layers)
-                rep.disable_git_operations()
+                rep.disable_operations()
             else:
                 path = path or os.path.join(self.kas_work_dir, name)
                 rep = Repo(url=url,