Remove Nova v3 API config

Nova v3 API has disappeared, and Tempest isn't testing the API on the
gate now. In addition, Nova team is creating a new REST API "Nova v2.1
API + microversions" and the interfaces are different from v3 API.
So it is not necessary to keep Nova v3 API tests in Tempest.
This patch removes the API config.

Change-Id: I6c0dc4ff1b05dcf29aae2937104dacf55384d12f
Correctly fetch the ips from server

In _check_tenant_network_connectivity(), server's ips are not fetched
correctly. Current code throw KeyError as mentioned in bug.

This patch fix the above issue.

Change-Id: Ibf9b3997b927a66c507f04e2671faf9cb8581ff3
Closes-Bug: #1401028
Avoid overlapping subnets in class NetworksTestJSON

When allow_overlapping_ips is False, some of the tests in
"NetworksTestJSON" class are failing.

This class creates a subnet 10.100.0.0/28 as part of resource_setup.
This subnet is used in test_(list/show) tests. Other kind of tests
in this class (i.e tests_create_) first try with 10.100.0.0/28 subnet,
it fails, then they try next subnet block i.e 10.100.0.16/28 but
this also fails as the parameters(ex, gateway, allocation_pools) with
which the tests try to create still belongs to 10.100.0.0/28.
Having overlapping ips in the same tenant is bad practice even when
allow_overlapping_ips is enabled.

So create the subnet for the class from the last subnet block
(10.100.255.240/28),so that the subnet in both the kind of tests won't
overlap. Also delete the subnets in "test_create_delete_ " tests
if they are not deleting, so that it won't fail when next test tries
to create same subnet.

Closes-bug: #1393564
Change-Id: I6861c7cf09a9a5e8765d78fe7913cfe9b49233ab
Remove python client related logging

The manager.py had several special logging setting for avoiding,
stderr logging when using the nova/cinder python-*client.
Since we are not using these client anymore, this workaround is not
necessary and should be removed.

Change-Id: I7c7594ff45ed7275ebd8c849e118066220f3aafb
Merge "Remove python client related logging"
Merge "Correctly fetch the ips from server"
Merge "Remove Nova v3 API config"
Merge "Avoid overlapping subnets in class NetworksTestJSON"