add TRACE level to the items that are being flagged

Change-Id: I7f13829abe2f5c7a5f0b9173acf43b3c709b1a5e
Stop running CONF getattr during import

This commit fixes 2 cases where a getattr was being run during test
file import which causes errors to be printed if a config file isn't
present.

Change-Id: I44a7750860c0a024997db5dd9ff3fa5b7332993a
image(s) schema image metadata API test

This patch is added to test get_images_schema and get_image_schema
image metadata APIs.
In addition to this, it changes the client function written for
these APIs.
A single method is written to merge all the schema client methods,
thus giving better way to code utilization.

Change-Id: I0fbd557e7abb7227b94488b270760858e0f32ca4
Add status code checks for Nova attach_interfaces API

Current API tests of attach_interfaces do not check the status code
of a response. This patch adds these checks for blocking backward
incompatibility changes.

Change-Id: Ib5ad54d047cf368e1185f1b4ce10c2d6c906ea9d
Merge "Add status code checks for Nova attach_interfaces API"
Merge "add TRACE level to the items that are being flagged"
Merge "image(s) schema image metadata API test"
Merge "Stop running CONF getattr during import"
Merge branch 'master' of https://github.com/openstack/tempest