port nova v2 images related tests into nova v3 part1

This changeset only copies the v2 files into the appropriate v3
directories unchanged. This is being tried in order to make
reviewing of the porting easier as gerrit will display only what
is actually changed for v3 rather than entirely new files.

Partially implements blueprint nova-v3-api-tests

Change-Id: I4355adee713bb217da7f12d4c2fe9b8abf015b05
Add tests for snapshot_metadata

Add tests for snapshot_metadata.

Change-Id: I651200dcdbecf5c4c520e5957ffea3908a4423ef
API tests for Ironic

Ironic is a baremetal provisioning service that
is intended to replace nova-baremetal-driver.

Recently it was integrated to devstack so now
it's reasonable to start testing it with tempest.

This patch adds a client for baremetal
provisioning service and some tests for the Ironic API.

Change-Id: Ifd65d6a60179e72dbfa81825f234f0ff76ebb055
Delete a BuildError server

If a server creation fails with create_test_server() in setUpClass,
the server would not be removed because tearDownclass is not called.
As the result, many BuildError servers are created and "Quota exceeded"
happens if server creations continue to fail.

This patch makes create_test_server() removes a server when BuildError
happens for avoiding "Quota exceeded" exception and investigating the
original problem which is due to the BuildError.

Change-Id: I55bb386bbea550de11cc7a81c5d056680057523b
Related-Bug: #1257641
Merge "API tests for Ironic"
Merge "Add tests for snapshot_metadata"
Merge "port nova v2 images related tests into nova v3 part1"
Merge "Delete a BuildError server"