pool: Remove redudant rh/st jobs ls commands

Addresses duplicated functionality in the commands rh/st jobs ls
and rh/st ls. Both commands listed the restores/store requests on
the pool, although with different attributes. The additional
attributes have been added to rh/st ls and rh/st jobs ls has been
removed.

Target: trunk
Require-notes: yes
Require-book: yes
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: http://rb.dcache.org/r/5483/