Command-line flag library.
Emulates gflags by wrapping cfg.ConfigOpts.
The idea is to move fully to cfg eventually, and this wrapper is a
stepping stone.
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DECLARE(name, module_string, flag_values=<nova.openstack.common.cfg.CommonConfigOpts object at 0x7f96c8c478d0>)
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exception UnrecognizedFlag
Bases: exceptions.Exception
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parse_args(argv, default_config_files=None)