Add the command to run_command error and debug logging

I was debugging an issue and seeing rc's but not completely
sure which command they were caused by. I think it's just nice
to include what generated an rc, and also have all the output
on the same line to remove any uncertainty.

For example, instead of:

rc: -15
error:

rc: -15
error:

You'll see:
rc: -15  error:  returned from cmd: /usr/bin/example-command-here

Signed-off-by: Christy Perez <christy@linux.vnet.ibm.com>