cyclades: Create common '-u/--user' option
Create 'cli_option' module, to contain the common definitions for options of Synnefo management commands. Currently, it contains only the '--user' option definition which accepts user's UUID or email and annotates the command options with the 'user_id' and 'user_email' options. Finally, the module contains a helper function for creating boolean options that will parse the option value(str) to a boolean value.
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