Remove test_agent_management tests

The test_agent_management tests are duplicated entirely in
neutron-tempest-plugin. In addition, since both tests modify the
agents at the same time, they can cause each other to fail.

The only external references to these tests are in exclusion lists
or in lists of tests that should fail due to agent support not
existing in the particular driver.

Affected projects:
x/vmware-nsx
openstack/dragonflow
openstack/networking-midonet
openstack/tricircle
x/fuel-plugin-contrail

Change-Id: Ife2e494a1ec3d055e45d2852639b33b4a790c7d3
Closes-Bug: #1855985
1 file changed