tests/functional/aspeed: extract boot and login sequence into helper function

Extracted repeated boot and login steps into a new helper function.
No change in functional behavior.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250423072350.541742-10-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
1 file changed