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For the pkg/expect package, if the process has been stopped but there is no `Close()` call, the `ExitCode()` won't return exit code correctly. The `ExitCode()` should check `exitErr` and return exit code if cmd isn't nil. And introduces `exitCode` to return correct exit code based on the process is signaled or exited. Signed-off-by: Wei Fu <fuweid89@gmail.com>
pkg/ is a collection of utility packages used by etcd without being specific to etcd itself. A package belongs here only if it could possibly be moved out into its own repository in the future.