Move test_dhcp_port_status_active from neutron-tempest-plugin

test_dhcp_port_status_active is the only missing test in
tempest.api.network.admin.test_dhcp_agent_scheduler.
DHCPAgentSchedulersTestJSON compared to
n_t_p.api.admin.test_dhcp_agent_scheduler.DHCPAgentSchedulersTestJSON.
By moving it from n-t-p we can get rid of the whole module, reducing the
test duplications.

Change-Id: I1d6410bb0d9eed1bc1e8e503c1cada48d275a9af
1 file changed