Add the ability to instrument jobs

[vs49688]

It would be useful to be able to instrument job/agent performance along the lines of iostat:

#root@gpfs1 10:25:50 /local/home/user> iostat
Linux 3.10.0-514.el7.x86_64 (host) 	10/08/18 	_x86_64_	(40 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.59    0.00    0.87    0.01    0.00   98.53

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda               4.31         2.57        38.68   32836930  493431848
sdb               0.39         0.26        21.33    3267452  272117192