Dean Troyer 48352ee7c0 Create tools/install_prereqs.sh
* Factor system package prereq installs out to tools/install_prereqs.sh
* Set minimum time between runs with PREREQ_RERUN_HOURS
  default = 2 hours
* Create export_proxy_variables
* Force an update with install_prereqs.sh -f or by setting
  FORCE_PREREQ=true

Fixed an issue with exit/return in tools/install_prereqs.sh

Change-Id: I9a62090ad2f900b9b150cacb9cb02b326cb46972
2013-02-08 10:35:43 -06:00
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