Fixes for duplicateStderr (I833aeb3a)

* Separate code from data. $2 in limit.sh is an option list.
* Don't duplicate stderr on linux when limit.sh is not used, unless
  duplicateStderr is specified

Change-Id: I8e6e74810864830c12af627bfbe75e74ba34e3e3
Merge "Fixes for duplicateStderr (I833aeb3a)"