Bug in error handling code of AWS Flow initrc script

Any error in starting the workers results in the following being written to the log:

    Mixlib::ShellOut::ShellCommandFailed
    ------------------------------------
    Expected process to exit with [0], but received '1'
    ---- Begin output of /srv/www/workers/current/runner.initrc restart ----
    STDOUT: workers failed to start
    STDERR: cat: /var/log/workers.{log,err}: No such file or directory
    ---- End output of /srv/www/workers/current/runner.initrc restart ----
    Ran /srv/www/workers/current/runner.initrc restart returned 1