Add common method for advanced image configuration

Add setup_advanced_image() to BaseTempestTestCase and update tests
to use it.

Related-Bug: OSPRH-19617
Assisted-by: Claude Code Sonnet 4.5

Change-Id: I4abea05a565061a57f71c37b98a101129cb388e2
Signed-off-by: Renjing Xiao <rxiao@redhat.com>
5 files changed