Use the admin client for the QoS tag tests

By default, the network QoS policies can be created, updated
and deleted only by an administrator. This patch changes the client
used for these tests.

Related-Bug: #2037002
Change-Id: I37f46cf8f7991d49966d5e4a4598ed17ae7d392a
(cherry picked from commit c80538bcc28202369dca4ef15af032f3d4fd45cf)
1 file changed