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How to add a new option to a given volume ?
* Add a entry in 'struct volume_options options' with your key, what is
the type of the 'key', etc.
* The 'key' and corresponding 'value' given for the same by user are validated
before calling init() of the translator/transport/scheduler/auth-module.
* Once the complete init() is successful, user will get a warning if he has
given a 'key' which is not defined in these modules.