add copy for configspec
review
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ssh copy_file
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Avoid using grep and awk during OS detection
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Implement Docker backend
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Use iptables-save instead of iptables -S because RedHat 5 iptables does not have -S option
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Move spec/backend/exec/build_command_spec.rb from serverspec
Fix Rakefile so that specs for backends are tested in isolated environments
Add SpecInfra::CommandResult
Backends now return a CommandResult
Show the file name and line number that calls CommandResult#[]
Win32_Product call replaced with registry key search

1) Get-WmiObject Win32_Product is REALLY slow when you have lots of programs installed
2) The Win32_Product class works by enumerating every MSI package that is installed on the system. When a package is touched, it performs a reconfiguration where the application is validated (and repaired if found to be inconsistent with the original MSI). Serverspec should not be modifying the target machine, only testing its state.
3) The list that Win32_product produces is incomplete. For example, it is unable to find Google Chrome when it is present in "Add/Remove programs"
Fix to use SpecInfra::CommandResult
Fix to use SpecInfra::CommandResult
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