VIM identity operations test specification

Each test case requires documentation according to: * Use case specification * Test preconditions * Basic test flow execution descriptor * Post conditions and pass fail criteria

tempest.api.identity.v3.TestApiDiscovery.test_api_media_types tempest.api.identity.v3.TestApiDiscovery.test_api_version_resources tempest.api.identity.v3.TestApiDiscovery.test_api_version_statuses tempest.api.identity.v3.test_api_discovery.TestApiDiscovery.test_api_media_types tempest.api.identity.v3.test_api_discovery.TestApiDiscovery.test_api_version_resources tempest.api.identity.v3.test_api_discovery.TestApiDiscovery.test_api_version_statuses tempest.api.identity.v3.test_tokens.TokensV3Test.test_create_token