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"
Merge branch 'master' of https://github.com/openstack/tempest