Unskip test_register_get_deregister_ari_image

The test case skiped because of invalid state transitions and because of
wrong relative path handling, both issue has been fixed.
rong relative path handling, both issue has been fixed.

Change-Id: Ie8b4cb4ee69fb6765351cee9414d599cbae63db8
Add Neutron CLI tests to tempest

Basic, read-only tests for Neutron CLI client.
Checks return values and output of read-only commands.

Change-Id: I5384e063686d21f006f8837cd916177e3d490bd6
Handle a possible volume attachment visibility wait/race issue

The attached volume does not became necessarily immediately
visible on the guest even if the volume is in the 'in-use' state.
We may need to wait until it appears in the /proc/partitions
before any other action.

This patch also increase log verbosity, you will be able to see
 the actually visible partitions on the guest system.

Change-Id: I2b2d908b791d07066e5357ec0d213b953d5ce204
Merge "Add Neutron CLI tests to tempest"
Merge "Unskip test_register_get_deregister_ari_image"
Merge "Handle a possible volume attachment visibility wait/race issue"