* expose logs of Teleport child processes
Configures Teleport child proceses to log with the exact same
configuration as the parent process. Logs from child processes
previously were essentially discarded.
* Fix issues around os_log; Fix log spam from child process.
* Address comments; Fix lint.
* * Only write remote command failure errors to client tty
* Don't try to write errors to unserviced os.Stderr/Stdout of child process
* Don't connect networking stderr to parent process, just use logger
* Don't log client-responsible shell errors, e.g. shell interrupt
* Mention running teleport as root for common subprocess permission errors.
* Pass io.Discard pipe to child process if a log writer is not available.
* Fix tests with nil log writer.
* Add default child logger for tests.
* Fix lint.
* default to discard writer for tests.
* Write reexec errors to os.Stdout for parent process to digest.
* Address comments.
* Clean up child pipe copy logic.
* Cleanup log config inheritance.
* Address comments.
* Revert whitespace change.
* Fix typo.
* Fix merge conflict.
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Co-authored-by: joerger <bjoerger@goteleport.com>
