[plugins,utilities] Allow commands to discard stderr

Just add "stderr=False" to add_cmd_output() if you don't want the
command's stderr in the sosreport.

Signed-off-by: John Haxby <john.haxby@oracle.com>

Minor edits for pep8 conformance and to shorten the argument name.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
---
 sos/plugins/__init__.py | 29 +++++++++++++++++------------
 sos/utilities.py        |  5 +++--
 2 files changed, 20 insertions(+), 14 deletions(-)

0 files changed, 0 insertions, 0 deletions