Eliminate use of my_tee.

lib/gen_robot_plug_in.py
  - rvalidate_plug_ins:  I added call to sprint_error() to format error message.
  - rprocess_plug_in_packages: I eliminated the use of my_tee (which is not
    available in git repo).

Change-Id: Ifb62853887de9efface1d5a42e2a5c7477c1d9bf
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
1 file changed