Rename references to compute networks client

The single network client is going to be split out into multiple
clients, one of which will be called NetworksClient. This patch
renames references to the compute networks client (networks_client)
to avoid confusion or conflicts with the new networks client.

Partially implements blueprint consistent-service-method-names

Change-Id: I1730adb3258557698dbe15658bb1c12f2292c2fd
diff --git a/tempest/clients.py b/tempest/clients.py
index 28efd9d..2756fa8 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -59,7 +59,8 @@
 from tempest.services.compute.json.limits_client import LimitsClient
 from tempest.services.compute.json.migrations_client import \
     MigrationsClient
-from tempest.services.compute.json.networks_client import NetworksClient
+from tempest.services.compute.json.networks_client import NetworksClient \
+    as ComputeNetworksClient
 from tempest.services.compute.json.quota_classes_client import \
     QuotaClassesClient
 from tempest.services.compute.json.quotas_client import QuotasClient
@@ -262,7 +263,8 @@
         params.update(self.default_params)
 
         self.agents_client = AgentsClient(self.auth_provider, **params)
-        self.networks_client = NetworksClient(self.auth_provider, **params)
+        self.compute_networks_client = ComputeNetworksClient(
+            self.auth_provider, **params)
         self.migrations_client = MigrationsClient(self.auth_provider,
                                                   **params)
         self.security_group_default_rules_client = (