Move list_dhcp_agents_on_hosting_network()

list_dhcp_agents_on_hosting_network() sends a request to a resource
'/networks', so the method should be implemented in networks_client
for the consistent interfaces of tempest.lib.
This patch moves the method into networks_client.

Partially implements blueprint consistent-service-method-names

Change-Id: I46afe15452764fd2db7fce5d91096507e23aa4d6
3 files changed