Entering a very large number for idle_timeout is unchecked, crashes UI
Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1113349
Description of problem:
Idle timeouts can be distracting. Thus, uf a user enters a very large number in the config settings for idle_timeout, there is no bounds testing and the UI crashes.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. In config settings, change the idle_timeout value to something large like "9999999"
2. Begin navigating elsewhere in UI.
3. View results
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ArgumentError (year too big to marshal: 192146 UTC):
/usr/lib/ruby/gems/1.8/gems/passenger-4.0.18/lib/phusion_passenger/request_handler.rb:441:in `block (3 levels) in start_threads'
Sane bounds testing of this field (and all others!).