Migrate from using glance image-list to openstackclient

Modify instance of `glance image-list` to `openstack image list`,
in an effort to migrate all commands to unified CLI.

Change-Id: Ieef661d209606e088fbf6a3a394f9a6577667618
Sahara script modified with notification configuration

This change enable Sahara notifications if ceilometer is used

Partially implement: blueprint ceilometer-integration

Change-Id: I4ec79052194206481cfbbf0d848aa43bcb0c0660
Set suspend feature flag in tempest for ironic

Suspend isn't a feature supported by ironic/baremetal.

Change-Id: I49b3b07f9ffd3fcbda8e32e48dcf20062ac7f7d8
Merge "Set suspend feature flag in tempest for ironic"
Merge "Sahara script modified with notification configuration"
Merge "Migrate from using glance image-list to openstackclient"