3ea8da179a
1. in ticket_lifetime() calculate the remaining lifetime of the ticket rather than the requested lifetime. 2. in renew_func(), attempt to renew if the tickets are renewable rather than only if --renewable is specified. 3. fix the call to renew_validate() in renew_func() to specify renewable tickets if the original tickets are renewable rather than only if --renewable is specified. 4. stop printing constant warnings to the terminal about how tickets cannot be obtained if they expire, cannot be renewed and we can't non-interactively obtain fresh ones. We limit it to a single warning. 5. after the tickets expire, we backoff the requests to obtain fresh tickets exponentially.
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