Indicates the operational source of a device's provisioning of
QoS policy.
Note that when qosPrAdminPolicySource transitions to cops(3),
qosPrOperPolicySource will normally also transition to
cops(3). In this situation, it is possible that
qosPrOperPolicySource's transition will not occur immediately
because the system is initializing the COPS function at the
system booting up time, but rather after a small time lag to
complete certain operations before going 'cops'.