Stop obsuring stderr when installing with yum

Over time, the code that actually used the buffer we stored stderr in
was removed, leaving us holding error messages and never displaying
them.

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Remove setting of unused 's3_branch' value

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add new job_status module

Provides methods for getting and setting job status. This is necessary
because we used to just use a boolean called 'success'. In order to stop
reporting infrastructure errors as failures, we need more than just a
boolean.

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Use new functions provided by job_status

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>