Add missing test to the Makefile.am
Add test

Validate that mod QoS modifies the preempt QoS when using =, +=, -=
Backport mod_qos from 14.11 for globals_accounting
Change loop to only add/remove qos once instead of multiple times
Change function (mod_qos) as to not confuse with the globals_accounting
function of the same name.
Give slightly easier to read output.
Check to make sure user can run test
Simplify add/remove of QOS
Add output of what is being tested
Merge remote-tracking branch 'origin/slurm-14.03'