lisa.conf: Use deepcopy in MultiSrcConf.get_key()
Always return deepcopy of values when accessed through
get_key/__getitem__. That ensures that the configuration object is not
modified unexpectedly by one of its client in any way.
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Always return deepcopy of values when accessed through
get_key/__getitem__. That ensures that the configuration object is not
modified unexpectedly by one of its client in any way.