Change  2>&1 in doTransform to use wfShellExecWithStderr instead

This would allow cgroup related errors to be captured.

Bug: 59986
Change-Id: Ica8e37d1c1bea3b68c0165109aa7b9330fe9128a
Merge "Change  2>&1 in doTransform to use wfShellExecWithStderr instead"