schedule: add option to display jobs in the queue
schedule: add option to display jobs in the queue

beanstalkd doesn't let you list jobs in the queue, but you can
inpsect specific job ids.

michaelsevilla/teuthology,yghannam/teuthology,robbat2/teuthology,ivotron/teuthology,caibo2014/teuthology,dreamhost/teuthology,robbat2/teuthology,ktdreyer/teuthology,zhouyuan/teuthology,SUSE/teuthology,ktdreyer/teuthology,dreamhost/teuthology,dmick/teuthology,ivotron/teuthology,yghannam/teuthology,ceph/teuthology,t-miyamae/teuthology,tchaikov/teuthology,SUSE/teuthology,caibo2014/teuthology,michaelsevilla/teuthology,dmick/teuthology,ceph/teuthology,tchaikov/teuthology,SUSE/teuthology,dmick/teuthology,zhouyuan/teuthology,t-miyamae/teuthology