patch 8.0.1742: cannot get a list of all the jobs

patch 8.0.1742: cannot get a list of all the jobs

Problem:    Cannot get a list of all the jobs.  Cannot get the command of
            the job.
Solution:   When job_info() is called without an argument return a list of
            jobs.  Otherwise, include the command that the job is running.
            (Yegappan Lakshmanan)